Removed obsolete methods

Feedback is stored in memory on the server, and not inside
CouchDB any more.
Added easier to use CouchDB view
Removed unused imports
Added mehods to directly support arrays
Added convenience methods
Added number support for keys
Replaced CouchDB4J View class with own extension

Lots of redundand code deleted thanks to this change
Do not handle single keys as numbers

This is a workaround when a session keyword is entered as a single key
Removed obsolete feedback methods