Added Method to remove background image.
Added dependency on Microsoft.Bcl.Compression. Modified TwitterExecute in PCL to manually manage compression in stream responses. Still have problems with Windows Phone compression buffering, so added a SupportsCompression propety to IAuthorizer to allow users to turn off compression if buffering causes them problems. Fixed Task.Result bugs to allow streaming to run asynchronously.
Fixed exception handling for ExecuteTwitterStream.
Merge branch 'master' of https://git01.codeplex.com/linqtotwitter
Implemented conversations as StatusType.Conversation. Added a demo to Linq2TwitterDemos_Console.
Merge branch 'master' of https://git01.codeplex.com/linqtotwitter
Merge branch 'master' of https://git01.codeplex.com/forks/mdumouchel/linq2twitter into mdumouchel/linq2twitter
Adding Matt Dumouchel's pull request for RemoveBackgroundImage.
Adding Matt Dumouchel's pull request for RemoveBackgroundImage.
Merge branch 'mdumouchel/linq2twitter'

Conflicts:
	LinqToTwitterAg/Account/AccountExtensions.cs
	LinqToTwitterDemo/AccountDemos.cs