Flask: url static map

* Overwrites blueprint static urls to application ones and serves them
  from the original places.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
datastructures: SmartDict.update() addition (closes #173)

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
JsonAlchemy: bug fix for json_reader
JsonAlchemy: context added WIP