Merge pull request #47 from gjb2048/master

Thankyou for these changes. Especially the optimisations are much appreciated. I am thinking I will see if I can push this through some form of code review to determine if other efficiencies can be found. And I be grateful for ye Pirate pack. AYE!
Fix issue with displaying glossary icons
Update theme_essential.php
Impementing Lang Menu fix - CONTRIB-4501
Fix for CONTRIB-4524

Fix for content edit block pulls to the right and overlaps third column
bootstrapcdn and bootstrapcdndesc translate
Merge pull request #50 from felixod/patch-12

bootstrapcdn and bootstrapcdndesc translate
Merge pull request #48 from felixod/patch-11

Update theme_essential.php
Updating Moodle minimum requirements

The method 'blocks()' used by this theme was introduced by Sam in
MDL-39841 in '/lib/outputrenderers.php' and integrated in core in
2013051400.05 2.5+ (Build: 20130614).

Older version of Moodle that does not have the method and therefore
this thee requires 2013051400.05
have theme renderer extend from theme_bootstrapbase_core_renderer

Changed theme renderer to extend theme_bootstrapbase_core_renderer and
removed redundant code
Add ability to work with Google Analytics
Significant formatting changes to Tabs and gradebook
Color changes to Gradeboo cat levels
removing bad formatting for #page
fixing grade category colors
Fixing Grade category colors
Fix missing icons CONTRIB-4539
Impleenting cursor fix CONTRIB-4538
Implementing Google Analytics
Enable analytics on all layouts