Assume dictionary keys are non-null
Merge pull request #278 from sharwell/NonNullKeys

Assume dictionary keys are non-null
Add support for Cloud Monitoring (fixes #229)
Add extension methods for calling IMonitoringService methods synchronously
Merge pull request #279 from sharwell/fix-229

Add preliminary support for Cloud Monitoring
Rename DefaultBackoffPolicy to BackoffPolicy to match class name
Include synchronous extensions for ILoadBalancerService in the .NET 3.5 release
Merge pull request #280 from sharwell/BackoffPolicyFilename

Rename DefaultBackoffPolicy to BackoffPolicy to match class name
Merge pull request #281 from sharwell/SyncLoadBalancerNet35

Include synchronous extensions for ILoadBalancerService in the .NET 3.5