Merge pull request #11 from Gayany/master

Merging pull request from Gayan for repositioning input and output edit parts
* Applying fix from Thilini for TOOLS-2393.
DataMapper mediator serialize/deserilize logics implemented
org.wso2.carbon.mediator.datamapper-4.2.1.jar added to library project
and refered from there
* Fixing TOOLS-2396, TOOLS-2395, TOOLS-2394.
Merge branch 'master' of https://github.com/wso2-dev/developer-studio
Merge pull request #12 from wso2-dev/master

Merge pull request #8