Replace TravisCI with CircleCI

This is the result of two
discussions on our research board.
The first was to replace Travis with CircleCI:
https://trello.com/c/Se4mELMh/199-hosted-ci-for-continuous-deployment

A few reasons we've enjoyed using Circle:

* Faster builds due to parallel builds
* Built in bundle caching
* Easy deployment
* Really easy setup
* The ability to ssh
  into the CI server during a test run.
  This has been great
  when debugging a test failure.
  It's not something you use a lot
  but it is so great when you need it.
* A free plan for private repos that supports small MVPS

This also adds automatic deployment
to staging when the build passes.
This is the result of this discussion:
https://trello.com/c/Se4mELMh/199-hosted-ci-for-continuous-deployment

A few reasons for those who don't have access to the trello card:

* Part of the CI now is whether or not you can actually deploy successfully.
  If you merge to master,
  it will automatically try and deploy to staging.
  If that fails,
  your build will actually fail.
  This should be treated
  with the same urgency that any other failing build
  on master would be treated.
* Staging is always up to date.
  This makes it really nice for verifying stories for clients.
* Automate more things!

README.md

@@ -97,7 +97,7 @@ Suspenders also comes with:
 * [t() and l() in specs without prefixing with I18n][i18n]
 * An automatically-created `SECRET_KEY_BASE` environment variable in all
   environments
-* Configuration for [Travis][travis] Continuous Integration (tests)
+* Configuration for [CircleCI][circle] Continuous Integration (tests)
 * Configuration for [Hound][hound] Continuous Integration (style)
 * The analytics adapter [Segment][segment] (and therefore config for Google
   Analytics, Intercom, Facebook Ads, Twitter Ads, etc.)
@@ -107,7 +107,7 @@ Suspenders also comes with:
 [pool]: https://devcenter.heroku.com/articles/concurrency-and-database-connections
 [binstub]: https://github.com/thoughtbot/suspenders/pull/282
 [i18n]: https://github.com/thoughtbot/suspenders/pull/304
-[travis]: http://docs.travis-ci.com/user/travis-pro/
+[circle]: https://circleci.com/docs
 [hound]: https://houndci.com
 [segment]: https://segment.com
 

lib/suspenders/app_builder.rb

@@ -209,8 +209,8 @@ def configure_rspec
       copy_file "spec_helper.rb", "spec/spec_helper.rb"
     end
 
-    def configure_travis
-      template 'travis.yml.erb', '.travis.yml'
+    def configure_ci
+      template "circle.yml.erb", "circle.yml"
     end
 
     def configure_i18n_for_test_environment

lib/suspenders/generators/app_generator.rb

@@ -95,7 +95,7 @@ def setup_test_environment
       build :configure_background_jobs_for_rspec
       build :enable_database_cleaner
       build :configure_spec_support_features
-      build :configure_travis
+      build :configure_ci
       build :configure_i18n_for_test_environment
       build :configure_i18n_tasks
       build :configure_action_mailer_in_specs

templates/circle.yml.erb

@@ -0,0 +1,8 @@
+test:
+  override:
+    - bundle exec rake
+deployment:
+  staging:
+    branch: master
+    commands:
+      - bin/deploy staging