Add stylesheets for resource
Also add css for context (different color)
Context- and ResourceControllers#index show correctly

* only Resource and only Contexts
Fix a comment
Resource#new has a select box for a context
Add default Contexts

* public today
* personal today
* business today
Resource#create uses the context for the resource creation

* this only does a create new context
* TODO : find or create (if similar context present, find and reuse it)