Update version and changelog
Merge pull request #914 from andrerod/release-0.7.12

Update version and changelog
Adding null check for AddressSpace in VPNClientAddressPool node under Gateway
Merge pull request #915 from anumsopentech/release-0.7.12

Adding null check for AddressSpace in VPNClientAddressPool node under Ga...
throw error if wrong setup environment for apns and mpns certificates
Merge pull request #918 from andrerod/release-0.7.12

throw error if wrong setup environment for apns and mpns certificates
Improve errors
Fix for xplat issue #809
response to review feedback
Merge pull request #925 from markcowl/release-0.7.12

Fix for xplat issue #809
Merge pull request #931 from WindowsAzure/release-0.7.12

Release 0.7.12