Merge pull request #118 from guangyang/dev

merge from master to dev
Bug fix related to add role api.
Merge pull request #119 from MSOpenTech/sql_rdfe_add_role_cloud_services

Bug fix related to add role api.
Added API for availability set
Bug Fix: HTTP 307 Redirection error
Bug Fix integration test
Update README.md
Merge pull request #121 from MSOpenTech/sql_rdfe_add_role_cloud_services

Added availability set to virtual machine and fixed HTTP 307 Redirection error.
disable integration tests in travis