Rails 5 upgrade commit messages

gistfile1.txt

* makes bundle update succeed

* fixes config.serve_static_files deprecation

* fixes config.static_cache_control deprecation

* fixes raise_in_transactional_callbacks deprecation

* replaces config.assets.precompile with manifest.js

* fixes middleware builder deprecation

* upgrade will_paginate to fix i18n_path error (rails/rails#21228)

* fixes rails/test_unit/sub_test_task removal

* changes after running migration post-rails5 (ar_internal_metadata)

* fixes devise deprecation

* removes usage of ActionController::TestResponse which has been removed

* replaces privatized method ActiveSupport::TimeZone#zones_map with a public API

* fixes method signature for ActionDispatch::IntegrationTest

* fixes forcing an association to reload by passing in true

* works around stricter params handling in rails 5

* fixes modifying a read-only record

* upgrades capybara that no longer uses Rack::Utils#normalize_params

* removes deprecated errors.set and errors.get

* fixes devise_parameter_sanitizer.for deprecation

* fixes params manipulation

* disables the after_commit callback from polluting the spec

* fixes scss filename deprecation

* fixes deprecated assigns usage in spec

* renders csv instead of render :text which is deprecated

* fixes have_selector with hidden fields

* fixes deprecated way passing in arguments to String#parameterize

* fixes callback not defined due to a conditional option

* works around a strange bug where grape rescue_from doesn't register other types of exceptions

* configures sidekiq as the active_job adapter

* replaces AD::Http::UploadedFile with fixture_file_upload