Merge pull request #39 from ivan-shaporov/dev

Manual merge of latest changes and retry policies.
Fixing references to Moq package
Removing unused namespaces, fixing serialization bug related to BaseMediaContext
Merge pull request #40 from gtrifonov/dev

Fixing serialization bug related to serialization in JobNotificationSubscriptions
Asset and AssetFiles retries for SaveChanges()
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-for-media-services into dev