Fixes issue SS-393 improvement by adding UI to get name when creating data source in RSS

1. the method 
org.wso2.carbon.rssmanager.core.service.RSSManagerServiceImpl.addCarbonDataSource(String, UserDatabaseEntryInfo) 
was changed to org.wso2.carbon.rssmanager.core.service.RSSManagerServiceImpl.addCarbonDataSource(String, String, UserDatabaseEntryInfo)
adding datasource name parameter

2. Added createDataSource.jsp filet oorg.wso2.carbon.rssmanager.ui component
3. Added new RSSAdmin.wsdl to org.wso2.carbon.rssmanager.stub