Fixes some issues with the bootstrap slingbar and flyout sidebar
(cherry picked from commit 1fb77e7)
Fixes loading of base 3rd party library css files via css_primer which along with 'normalize' wasn't working.  Also now allow less primer files...style loading sequence is now primer (normalize is ALWAYS first), core, system, theme [#1121 state:resolved]
Merge branch 'develop' into bootstrap3dave

Conflicts:
	framework/core/subsystems/expJavascript.php