added check for empty techMD on Bitstreams
added Representation/File/Bitstream deseriliazation fix, added test
fixed serialization of representation title, removed rep usage and bitstream title, since no semantics there
fixed alternative identifier serialization/deserialization and added a test for it
removed unnecessary logging from tests
added Plan objects and plan execution test;version bumped
added PLanExecutionState and it's collection
added Classes for Plan management API
Merge branch 'master' of https://github.com/openplanets/scape-platform-datamodel