gem / bundle fail for heroic-sns on travis-ci

gistfile1.txt

rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ ruby --version ; rvm --version ; bundle --version ; gem --version
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-linux]
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Bundler version 1.7.6
2.5.1
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ bundle install --jobs=3 --retry=3
Resolving dependencies...
Using json 1.8.3
Using rake 10.5.0
Using rack 1.6.4
Using bundler 1.7.6
Using rdoc 4.2.2

NoMethodError: undefined method `spec' for nil:NilClass
An error occurred while installing heroic-sns (1.1.2), and Bundler cannot continue.
Make sure that `gem install heroic-sns -v '1.1.2'` succeeds before bundling.

#### reconfigure to use gem version 2.4.2 ##########

rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$  ruby --version ; rvm --version ; bundle --version ; gem --version
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-linux]
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Bundler version 1.7.6
2.4.2
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ bundle install --jobs=3 --retry=3
Resolving dependencies...
Using json 1.8.3
Using rake 10.5.0
Using rack 1.6.4
Using bundler 1.7.6
Using rdoc 4.2.2
Using heroic-sns 1.1.2 from source at .
Your bundle is complete!
Use `bundle show [gemname]` to see where a bundled gem is installed.

#####################################################
##### Go back to gem 2.5.1 but bundler 1.11.2 #######
#####################################################

rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$  ruby --version ; rvm --version ; bundle --version ; gem --version
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-linux]
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Bundler version 1.11.2
2.5.1
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ bundle install --jobs=3 --retry=3
Resolving dependencies...
Using rake 10.5.0
Using json 1.8.3
Using rack 1.6.4
Using bundler 1.11.2
Using rdoc 4.2.2
Using heroic-sns 1.1.2 from source at `.`
Bundle complete! 3 Gemfile dependencies, 6 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.

#####################################################
##### gem 2.5.2 but bundler 1.7.6: FAIL         #####
#####################################################


rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ gem uninstall bundler

Select gem to uninstall:
 1. bundler-1.7.6
 2. bundler-1.11.2
 3. All versions
> 2
Successfully uninstalled bundler-1.11.2
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ 
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ 
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ 
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$  ruby --version ; rvm --version ; bundle --version ; gem --version
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-linux]
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Bundler version 1.7.6
2.5.2
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ bundle install --jobs=3 --retry=3
Resolving dependencies...
Using rake 10.5.0
Using rack 1.6.4
Using bundler 1.7.6
Using json 1.8.3
Using rdoc 4.2.2

NoMethodError: undefined method `spec' for nil:NilClass
An error occurred while installing heroic-sns (1.1.2), and Bundler cannot continue.
Make sure that `gem install heroic-sns -v '1.1.2'` succeeds before bundling.
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ 

#####################################################
##### gem 2.6.2 (most recent), bundler 1.7.6: FAIL  #
#####################################################

rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ gem update --system 2.6.2
Updating rubygems-update
...
RubyGems system software updated
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$  ruby --version ; rvm --version ; bundle --version ; gem --version
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-linux]
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Bundler version 1.7.6
2.6.2
rcobb@rcobb-x250: (6280738...) ~/github/benzado/heroic-sns$ bundle install --jobs=3 --retry=3
Resolving dependencies...
Using json 1.8.3
Using rake 10.5.0
Using rack 1.6.4
Using bundler 1.7.6
Using rdoc 4.2.2

NoMethodError: undefined method `spec' for nil:NilClass
An error occurred while installing heroic-sns (1.1.2), and Bundler cannot continue.
Make sure that `gem install heroic-sns -v '1.1.2'` succeeds before bundling.