New query type to upload rich text documents using the
ExtractingRequestHandler in Solr.

- corrected the input format for the datetime objects (prefix timestamps with @)
- fixed timezone issue by forcing UTC
- refactored formatDate into a single function and without duplicate date objects

fix issue #58 add formatDate to query helper

- added both the original resource and the urldecoded version to the __toString() output
- added a testcase for __toString()