Merge pull request #101 from wso2/developer-studio-3.7.0

Developer studio 3.7.0
change devS version to 3.7.0 in welcome.xml file
Refactoring App Factory tools.
fix for TOOLS-2544
Merge pull request #102 from kaviththiranga/developer-studio-3.7.0

Refactoring App Factory tools.
Applying patch from sohani to fix TOOLS-2545
Merge branch 'developer-studio-3.7.0' of https://github.com/wso2-dev/developer-studio into developer-studio-3.7.0
Merge pull request #14 from wso2-dev/developer-studio-3.7.0

Developer studio 3.7.0