Upgraded Service Management Versioning to 2014-04-01

Created separate API for add role.
Logical Unit Number(lun) is optional argument in API add_data_disk.
Cloud service should delete only if there are no other VMs/Deployments in the cloud service.
Added more sizes(Basic_A0, Basic_A1, Basic_A2, Basic_A3, Basic_A4) options for Virtual Machine and Cloud Service.