Updated assembly version to v1.1.1.0 and updated documentation
Updated NuGet specs
Updated the README file
Use ConcurrentDictionary in UserAccessCache to support concurrent operations
Use Lazy<T> for the initialization of the default UserAccessCache instance
Merge pull request #85 from sharwell/ConcurrentUserAccessCache

Concurrent UserAccessCache
[Delivers #49344721 Fix Volume - Attachment property to resolve serialization issues