Merge pull request #50 from wso2-dev/master

Merge pull request #37
Merge pull request #51 from wso2-dev/master

Merge pull request #38
Merge pull request #52 from wso2-dev/master

Merge pull request #39
Adding anonymous root support for json
Adding null array support for schema builder
Merge pull request #78 from Gayany/master

Adding null array support for schema builder and anonymous root support for json