Added a test case
Adding lookkup table for getting class hierarchy node

Adding lookkup table for getting class hierarchy node in protobuffer
class hierarchy
Adding test case
Adding Task bin file for testing
Change GetNode in protobufferclasshierarchy to find node from lookup table

Change GetNode in protobufferclasshierarchy to find node from lookup
table
Merge branch 'master' of https://github.com/Microsoft-CISL/TANG into juwang_deserialization_test
Add catch exception in GetNode() and tests

Add catch exception in GetNode() and testDeserializationForHelloTask
Consolidate the two tests
Merge branch 'master' of https://github.com/Microsoft-CISL/TANG into juwang_deserialization_test
Merge pull request #163 from Microsoft-CISL/juwang_deserialization_test

I confirmed this not to break any of the unit tests in REEF master and the currently open pull requests.