Fix #27: Error when accessing a resource which has at least one child
ServletResource 

This is more or less a workaround, since ServletResource is not public,
but at least unblocks browsing.
Merge pull request #28 from rombert/issues/27

Fix #27: Error when accessing a resource which has at least one child ServletResource
Fixed error while editing multiple valued fields (JS error)
Create properties of type other than String (Fixes #29)
@trivial Updated comments for the POST request wrapper
Minor code adjustments
Minor code adjustments