updated selected background on repeater datepicker and tree. Changed colors to gray and added variables for hover, selected and hover selected
Merge pull request #852 from interactivellama/selection-bg-color-846

Update selected background on repeater, datepicker, and tree
Merge branch 'master' into repeater-thumbnail-fix

Conflicts:
	less/repeater-thumbnail.less
Merge branch 'master' into repeater-thumbnail-fix

Conflicts:
	less/repeater-thumbnail.less