rubik 7.x-4.0

First Drupal 7 stable release of Rubik.

Changes since RC1:
#1387376: Form Buttons need proper CSS styling
#1487744: Labels readability
#1977442: Media module uses a-tags with class button
#2001470: No icons in "Recent log messages"
#2216839: Style cancel button when using confirm_form function
#2212373: Set admin page odd rows background-color
#1792700: Rubik and rules
#1635790: File input fields aren't styled so they look awful in IE7-9
#2192145: Help information UI needs to be improved.
#1626886: Make sidebar sticky and add sidebar field option
#2190887: Facet table in Search API overlays descriptions.
#2183131: Some collapsible fieldsets hidden in Views Admin
Only print form actions if they exist.
#1839694: Allow more space for secondary tabs
#2171423: Field Formatter Settings in Display Suite (Field Labels)
#1545882: Better accessibility for menu_local_tasks secondary tabs
#1184722: Drupal.behaviors.rubik have a great performance leak
#1388114: Views admin styles for Rubik
#1348142: Field group support for form columns