Merge pull request #22 from Gayany/master

Merging pullreq from GayanK for 'Adding import existing configuration functionality'
operators InNode drop zone set to OperatorLeftConnector
Merge pull request #17 from wso2-dev/master

Adding import existing configuration functionality
Refactoring the code to increase the performance
Merge branch 'master' of https://github.com/wso2-dev/developer-studio
datamapper config generation enhancements
Merge pull request #24 from lsdeva/master

operators InNode drop zone set to OperatorLeftConnector
* Salesforece mapping config with decomposed functions.
* Data mapper config generation modifications.
Merge pull request #20 from wso2-dev/master

Merge pull request #15