[Therubyracer]

  - Remove gem and intall Nodejs for local envronment.
Reorder Integration Code

  - Move code to right place for Articles and Tips.
  - Hide seach Articles controls, not implemented yet.
Remove Article Tags

  - Remove act_as_tag_on gems.
  - Remove tags tables.
  - Remove tags list fields from CMS.
  - Remove tags from permited param from Ative Admin for Articles.
  - Remove tags from blog index page and replace this with categories.
  - Remove routes for tags list.
  - Remove acts_as_taggable from the articles model.
  - Remove validations for tags list.
  - Remove tag instance variable from base controle for blog.
  - Fix Spec coverage.