Merge pull request #1011 from cspanring/grunt

grunt integration for managing client libraries
adds missing select2 images to repo. closes #1023
Merge pull request #1027 from cspanring/patch-1023

adds missing select2 images to repo. closes #1023
Merge branch 'master' into grunt

Conflicts:
	geonode/static/gruntfile.js
remove obsolete css/*.png|gif