Merge pull request #1782 from WindowsAzure/release-0.6.17

Release 0.6.17
Update version to 0.6.18
Merge pull request #1805 from markcowl/release-0.6.18

Update version to 0.6.18
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
Merge pull request #1818 from WindowsAzure/release-0.6.18

Release 0.6.18 to Master
Merge pull request #1851 from WindowsAzure/master

Merging master back to dev for previous release