Refactor bootstrap script.

* It's a class now
* Remove useless methods
* Install gems in to vendor/bundle on CI and to .bundle locally
Fix typo
Do not use simplecov on CI
Disable Fuubar formatter on CI
Fix path to readme file on dashboard
Merge branch 'master' into speed-up-semaphore-builds

* master:
  Fix path to readme file on dashboard
Move rspec formatter condition to .rspec from spec_helper.rb
Rename check_file to setup_file_from_template
Merge pull request #108 from fs/speed-up-semaphore-builds

Speed up semaphore builds