Require Angular 1.2, inject ngSanitize module
Option to disable message content escaping
Rename disableEscaping to enableHtml
implement "only unique messages", issue #8
Merge branch 'pr/5'

Conflicts:
	bower.json
	build/angular-growl.js
	build/angular-growl.min.css
	build/angular-growl.min.js
	src/growlDirective.js
	src/growlFactory.js
merge PR#5 (html in messsages), updated doc