MarkerClustererPlus 2.1: Allow for greater precision for placing text labels and icons plus allow use of Retina icons.

git-svn-id: http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus@453 b4c4f48c-70f0-11de-9ad3-cbed566d3045
MarkerClustererPlus 2.1: Re-incorporate old bug fix.

git-svn-id: http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus@454 b4c4f48c-70f0-11de-9ad3-cbed566d3045
MarkerClustererPlus 2.1.1: Fix for Issue 266 + Cleaned up label styling code.

git-svn-id: http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus@456 b4c4f48c-70f0-11de-9ad3-cbed566d3045
Issue 278 : Added check for existence of trim().
If trim() doesn't exist, add it to String. Hack for IE support.



git-svn-id: http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus@458 b4c4f48c-70f0-11de-9ad3-cbed566d3045
Merge branch 'master' into merge-test

* master:
  Issue 278 : Added check for existence of trim(). If trim() doesn't exist, add it to String. Hack for IE support.
  MarkerClustererPlus 2.1.1: Fix for Issue 266 + Cleaned up label styling code.
  MarkerClustererPlus 2.1: Re-incorporate old bug fix.
  MarkerClustererPlus 2.1: Allow for greater precision for placing text labels and icons plus allow use of Retina icons.

Conflicts:
	src/markerclusterer.js
Updating bower package and adding some additional documentation