Replace bootstrap static files by gem.
Provide a page_title utility for the css.
Add title variable for page.
Create a partial for flash messages.
Create a partial for form errors.
Correct edition link and add some tests for this.
Perfect will_paginage display.
Merge branch 'topic/reworkDesign' into develop

* topic/reworkDesign:
  Perfect will_paginage display.
  Correct edition link and add some tests for this.
  Create a partial for form errors.
  Create a partial for flash messages.
  Add title variable for page.
  Provide a page_title utility for the css.
  Replace bootstrap static files by gem.