Merge pull request #1782 from WindowsAzure/release-0.6.17

Release 0.6.17
Merge branch 'release-0.6.18' of https://github.com/WindowsAzure/azure-sdk-tools into release-0.6.18
update changelog and readme
Merge pull request #1814 from guangyang/release-0.6.18

update changelog and readme