Scaffolded Hydroshare API.
Hydroshare Users and Resource APIs done on the server side.  Need unit tests.  Bagit works.
Unit tests for hs_core.hydroshare.utils added.
Bagit moded into hs_core.hydroshare.hs_bagit.
Bag type added to hs_core.models
hs_core.AbstractResource now includes a DOI.  People should create migrations on their own resource types.
Scaffolding created for hs_core REST api.
Merge pull request #1 from hydroshare/hsapi

Merge the HSAPI branch with the master branch