Update directive to be able to add leaf to json object
@caroline @stuplum try to add ace-editor
change markup for new leaf  elements
fix unit test and styling
add test coverage for new leaf
add fix ace-editor
Merge branch 'ace-editor'

Conflicts:
	bower.json
	css/tree.css
	package.json
Add minified version
Update README.md
Merge pull request #1 from NowTV-Iceberg/master

Add ace-editor and ability do add new leaf