fixed readme
added rails assets integration
updated readme
Merge branch 'feature/rails-integration' into develop

* feature/rails-integration:
  updated readme
  added rails assets integration
moved to 'expect' syntax
moved gems to Gemfile against gemspec
added gemfile.lock to git stage
updated matchers
Merge branch 'bugfix/tests-for-ci' into develop

* bugfix/tests-for-ci:
  updated matchers
  added gemfile.lock to git stage
  moved gems to Gemfile against gemspec
  moved to 'expect' syntax
changed version number
Merge branch 'release/v0.4.1'

* release/v0.4.1:
  changed version number
  updated matchers
  added gemfile.lock to git stage
  moved gems to Gemfile against gemspec
  moved to 'expect' syntax
  updated readme
  added rails assets integration
  fixed readme