Merge pull request #2324 from WindowsAzure/release-0.7.3

Merge release into dev
update readme and changelog
Merge pull request #2325 from guangyang/release-0.7.3

update readme and changelog
Merge branch 'release-0.7.3' of github.com:WindowsAzure/azure-sdk-tools into dev
Merge pull request #2329 from guangyang/dev

from master to dev
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-tools into template