MOBSDK-768: Workflow constant value must respect Model definition pattern.
MOBSDK-737: Workflow enhancements (retrieving and updating process & task variables)
Fix config and model definition tests so they work across all test servers.

NOTE: There's still some outstanding issues with the model definition tests due to ACE-2904.
MOBMOBSDK-737: Workflow enhancements (added additional filtering options for processes and tasks)
When using the legacy API the state of the completed flag should be calculated using the "state" property not the presence of an end date (which can be null on 4.0 servers).
Merge pull request #325 from gavincornwell/1.4-dev

Workflow Enhancements (MOBSDK-737 & MOBSDK-768)