Added restart role API and tests.
Bug Fix in delete deployment API.
Indentation and test case cleanup.
Added API for add disk, restart role and add/update/delete virtual machine endpoint.
Unit and integration test for add disk, restart role and update endpoints.
Update Readme.
Merge pull request #129 from MSOpenTech/dev

Ruby SDK Enhancements PR
Merge pull request #127 from WindowsAzure/master

master to dev for release 0.6.1
update changelog
update version
Merge pull request #131 from guangyang/release-0.6.2

Release 0.6.2