not the only real dev language

-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.1.5
-----> Installing dependencies using 1.6.3
       Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
       Fetching source index from https://rubygems.org/
       Using minitest 4.7.5
       Installing multi_json 1.8.2
       Installing rake 10.1.1
       Installing i18n 0.6.9
       Installing builder 3.1.4
       Installing tzinfo 0.3.38
       Installing erubis 2.7.0
       Installing rack 1.5.2
       Installing mime-types 1.25.1
       Installing atomic 1.1.14
       Installing polyglot 0.3.3
       Installing activerecord-deprecated_finders 1.0.3
       Installing arel 4.0.1
       Installing addressable 2.3.5
       Installing handlebars-source 1.1.2
       Installing execjs 2.0.2
       Installing timers 1.1.0
       Using discourse_plugin 0.0.1 from source at vendor/gems/discourse_plugin
       Installing connection_pool 1.2.0
       Installing daemons 1.1.9
       Installing email_reply_parser-discourse 0.6
       Installing thor 0.18.1
       Installing excon 0.28.0
       Installing exifr 1.1.3
       Installing multipart-post 1.2.0
       Installing fastimage 1.5.2
       Installing fast_xs 0.8.0
       Installing formatador 0.2.4
       Installing net-ssh 2.7.0
       Installing mini_portile 0.5.1
       Installing ruby-hmac 0.4.0
       Installing fspath 2.0.5
       Installing get_process_mem 0.2.0
       Installing guess_html_encoding 0.0.9
       Installing hashie 2.0.5
       Installing highline 1.6.20
       Installing hike 1.2.3
       Installing hiredis 0.4.5
       Using json 1.8.1
       Installing httpauth 0.2.0
       Installing eventmachine 1.0.3
       Installing ice_cube 0.11.1
       Installing image_size 1.1.3
       Installing progress 3.0.0
       Installing in_threads 1.2.0
       Installing image_sorcery 1.1.0
       Installing ffi 1.9.3
       Installing lru_redux 0.8.1
       Installing redis 3.0.6
       Installing libv8 3.16.14.3
       Installing mustache 0.99.4
       Installing newrelic_rpm 3.9.9.275
       Installing oauth 0.4.7
       Installing msgpack 0.5.7
       Installing ruby-openid 2.3.0
       Installing oj 2.2.3
       Using bundler 1.6.3
       Installing tilt 1.4.1
       Using rails_multisite 0.0.1 from source at vendor/gems/rails_multisite
       Installing kgio 2.8.1
       Installing raindrops 0.12.0
       Installing redcarpet 3.0.0
       Installing ref 1.0.5
       Installing rinku 1.7.3
       Installing pg 0.15.1
       Installing sass 3.2.12
       Installing simple-rss 1.3.1
       Installing temple 0.6.7
       Installing jwt 0.1.8
       Installing rake-compiler 0.9.2
       Installing rack-test 0.6.2
       Installing trollop 2.0
       Installing rack-cors 0.2.8
       Installing unf_ext 0.0.6
       Installing rack-mini-profiler 0.9.0
       Installing rest-client 1.6.7
       Installing rack-protection 1.5.1
       Installing puma 2.6.0
       Installing thread_safe 0.1.3
       Installing treetop 1.4.15
       Installing faraday 0.8.8
       Installing celluloid 0.15.2
       Installing net-scp 1.1.2
       Installing omniauth 1.1.4
       Installing ember-source 1.2.0.1
       Installing honeybadger 1.16.7
       Installing uglifier 2.3.3
       Installing image_optim 0.9.1
       Installing message_bus 0.9.3.2
       Installing redis-namespace 1.3.2
       Installing thin 1.6.1
       Installing rack-openid 1.3.1
       Installing openid-redis-store 0.0.2
       Installing sprockets 2.10.1
       Installing unicorn 4.7.0
       Installing slim 2.0.1
       Installing fast_blank 0.0.1
       Installing fast_stack 0.1.0
       Installing fast_xor 1.1.2
       Installing therubyracer-discourse 0.12.0
       Installing unf 0.1.3
       Installing sinatra 1.4.4
       Installing activesupport 4.0.2
       Installing mail 2.5.4
       Installing oauth2 0.8.1
       Installing omniauth-browserid-discourse 0.0.2
       Installing omniauth-oauth 1.0.1
       Installing barber 0.4.2
       Installing ember-data-source 0.14
       Installing sidekiq 2.15.1
       Installing omniauth-openid 1.0.1
       Installing unicorn-worker-killer 0.4.3
       Installing flamegraph 0.0.5
       Installing actionpack 4.0.2
       Installing activemodel 4.0.2
       Installing airbrake 3.1.2
       Installing omniauth-oauth2 1.1.1
       Installing omniauth-twitter 1.0.1
       Installing sidekiq-failures 0.2.2
       Installing sidetiq 0.4.3
       Installing actionmailer 4.0.2
       Installing actionpack-action_caching 1.0.0
       Installing railties 4.0.2
       Installing sprockets-rails 2.0.1
       Installing active_model_serializers 0.8.1
       Installing activerecord 4.0.2
       Installing rails-observers 0.1.2
       Installing omniauth-facebook 1.4.1
       Installing omniauth-github 1.1.1
       Installing jquery-rails 3.0.4
       Installing nokogiri 1.6.0
       Installing sass-rails 4.0.1
       Installing seed-fu-discourse 2.2.0
       Installing rbtrace 0.4.1
       Installing rails 4.0.2
       Installing ember-rails 0.14.1
       Installing html_truncator 0.3.1
       Installing omniauth-cas 1.0.4
       Installing ruby-readability 0.5.7
       Installing sanitize 2.0.6
       Installing fog 1.18.0
       Your bundle is complete!
       Gems in the groups development and test were not installed.
       It was installed into ./vendor/bundle
       Bundle completed (311.08s)
       Cleaning up the bundler cache.
-----> Writing config/database.yml to read from DATABASE_URL
-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       rake aborted!
       invalid url
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/redis-3.0.6/lib/redis/client.rb:338:in `_parse_options'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/redis-3.0.6/lib/redis/client.rb:59:in `initialize'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/redis-3.0.6/lib/redis.rb:30:in `new'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/redis-3.0.6/lib/redis.rb:30:in `initialize'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/lib/discourse_redis.rb:11:in `new'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/lib/discourse_redis.rb:11:in `raw_connection'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/lib/discourse_redis.rb:25:in `initialize'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/config/initializers/01-redis.rb:3:in `new'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/config/initializers/01-redis.rb:3:in `<top (required)>'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:223:in `load'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:223:in `block in load'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:223:in `load'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/engine.rb:609:in `block (2 levels) in <class:Engine>'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/engine.rb:608:in `each'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/engine.rb:608:in `block in <class:Engine>'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/initializable.rb:30:in `instance_exec'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/initializable.rb:30:in `run'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/initializable.rb:55:in `block in run_initializers'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/initializable.rb:44:in `each'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/initializable.rb:44:in `tsort_each_child'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/initializable.rb:54:in `run_initializers'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/application.rb:215:in `initialize!'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/railtie/configurable.rb:30:in `method_missing'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/config/environment.rb:5:in `<top (required)>'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `block in require'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/application.rb:189:in `require_environment!'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/railties-4.0.2/lib/rails/application.rb:250:in `block in run_tasks_blocks'
       /tmp/build_b1c0006c4896e42d91bd604c251ea97a/vendor/bundle/ruby/2.1.0/gems/sprockets-rails-2.0.1/lib/sprockets/rails/task.rb:54:in `block (2 levels) in define'
       Tasks: TOP => environment
       (See full trace by running task with --trace)
 !
 !     Precompiling assets failed.
 !

 !     Push rejected, failed to compile Ruby app