1. RDFE Endpoint for SQL Servers
2. Storage Management:
2.1 Added get_storage_account API
2.2 Added update_storage_account API
3. Virtual Machine Management: Implemented Add Role API
4. Extended existing Cloud Services APIs to read all the parameters
5. Added/Modified related test cases
Changed naming of disable_sql_rdfe to disable_sql_endpoint.
Fixed EOL issues.
Fixed indentation issues.

Removed failed test cases.
Added Guang's suggestion

1. Renamed config value disable_sql_endpoint to sql_database_authentication_mode
2. sql_database_authenticaton will accept two values :sql_server or :management_certificate
3. Renamed config valuesql_management_endpoint to sql_management_endpoint
4. Removed RDFE from comment.
Sql database service code cleanup.
Updated README

Updated storage account integration test
Merge pull request #117 from MSOpenTech/sql_rdfe_add_role_cloud_services

Ruby SDK Enhancements PR