tags can now be created in the comma list
tags now use select2
a little form cleanup
put select2 into seperate file
formated select2 output
select2 is nor more integrated
cssrewrite so images can be loaded
Merge branch 'feature-tag-select' into development

Conflicts:
	src/Hn/AssetDbBundle/Controller/AssetController.php
	src/Hn/AssetDbBundle/Resources/views/Asset/show.html.twig