[Delivers #49344721 Fix Volume - Attachment property to resolve serialization issues
Merge pull request #1 from jasonmitschke/CloudBlockStorage_FixVolumeObjectIssue

[Delivers #49344721 Fix Volume - Attachment property to resolve serialization issues
ObjectManifestMetadataKey value should be lower case.

The API returns the value in lowercase

Dictionary.ContainsKey(CloudFilesProvider.ObjectManifestMetadataKey) always returns false due to case sensitivity
Merge pull request #3 from jonwalton/master

Fixes case sensitivity with CloudFilesProvider.ObjectManifestMetadataKey