Merge pull request #48 from shantanud/2.2

Fixed issue with the date type of properties in JSON writer
Fixed NPE for metadata while handling collection of complex
Fix build issues for android edition
Merge pull request #49 from onkar-dhuri/2.2

Fixed NPE for metadata while handling collection of complex
Fixed collection of complex parsing issue
Merge pull request #50 from onkar-dhuri/2.2

Fixed minor issue while parsing collection of complex