Merge pull request #796 from WindowsAzure/master

Leftover stuff that didn't get merged into dev.
Merge branch 'dev' into release-0.7.6
Update changelog
Update version number
Update readme.md
Merge pull request #799 from WindowsAzure/release-0.7.6

Release 0.7.6
Merge pull request #811 from WindowsAzure/master

Merge master back to dev
Fix for network configuration serialization for Subnets
Add GCM support
Updating tests to use mocked endpoint
Merge pull request #814 from tomconte/5b119bb2be600069582ab4ba1d220d867f8188e2

Fix for network configuration serialization for Subnets
Merge pull request #80 from andrerod/android

Add GCM support
Merge pull request #815 from andrerod/dev

Adding GCM support
Merge branch 'master' into dev
#677: Use retry filters in UT
Merge pull request #818 from andrerod/android

#677: Use retry filters in UT
Update changelog & package.json version number
updated readme for notification hubs
Merge pull request #824 from WindowsAzure/release-0.7.7

Release 0.7.7 to master
Merge pull request #825 from WindowsAzure/master

Merge release 0.7.7 from master to dev