changed mongokit version to 0.9.0
Updated libraries and moved unnecessary core elements.

Updated Flask to 10.1
Removed:
  Blinker
  Pytz
  Mongokit

Now, there are also no signals sent at any stage. Also the mongokit
validation has been removed. The needed libraries doesn't really warrant
the extra functionality for a core system. They can always be added
later.
various minor fixes
Added redirect option (simply set self.redirect to the url)
post requests returns 200 if pre_save_validation makes it an update