Merge pull request #8 from SamDeBlock/bugfix

Bugfix
Updated treegrid extensions
Fixed error in templating
allow group reordering
fix execution order of qunit tests
fix plugin load order in IE + unit test
Updated treegrid extensions
Fixed error in templating
Merge pull request #9 from SamDeBlock/treegrid

Updated treegrid extensions
fix unit tests + grouping
fix issue where pre-existing filter would not apply when grouping
fix issue where clicking the delete button would initiate a drag
fix IE issue
fix showing collapse/expand toggle in correct state
vertical scrollbar starts underneath headers
fix crash when no right frozen columns were present
- grouping & treegrid fixes
- fixed inclusive/exclusive bug in filtering
- added loading indicator
Merge branch 'master' of github.com:ccantill/powergrid into ccantill_master

Conflicts:
	web/extensions/grouping.js
	web/powergrid.js
rowhighlighting extension