Explain reasoning behind the spec rake task
Update ruby 2.1.5

https://devcenter.heroku.com/changelog-items/552
Merge pull request #105 from interagent/tmaier-update-ruby

Update ruby 2.1.5
add a descriptiont to the spec rake task
Merge pull request #104 from interagent/pedro-explain-spec-task

Explain reasoning behind the spec rake task
move all gem dependencies to the gemspec
lock main dependencies on the template app