fixing STRATOS-445
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-stratos
developed STRATOS-448
displaying two error scenarios
Handle http codes
returning a message from Rest API in case of void and boolean returns
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-stratos into rest_api_return_object