Asset and AssetFiles retries for SaveChanges()
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-for-media-services into dev
Retry logic for AccessPolicy, ContentKeys, Jobs, Locators, AccessPolicies, AssetFiles.
Merge pull request #41 from ivan-shaporov/dev

SaveChanges retries for Asset, AssetFiles.