Merge pull request #35 from wso2-dev/master

Merge pull request #24
Merge pull request #36 from wso2-dev/master

Handle NPE thrown in config generation after deleting an operation.
Fixing the issue of buiding input/output trees upwards
Merge pull request #44 from Gayany/master

Fixing the issue of buiding input/output trees upwards
Merge pull request #31 from wso2-dev/master

Merge branch 'master' of https://github.com/wso2-dev/developer-studio