fixed faulty case in references to NuGet.exe and NuGet.targets
removed block of NuGet.targets for 'Release Mono'
Merge remote-tracking branch 'official/master'
Merge branch 'master' of https://github.com/MediaBrowser/MediaBrowser
cleaned up left overs & removed last unnecessary mono filters
Merge pull request #890 from gsnerf/master

changes to allow mono builds (in linux)
updated nuget
Updated IApiClient to use default CancellationToken
add additional playlist buttons
added chromecast messaging
add activity log feature
Update ExternalPortForwarding.cs

I have edited this file just to share some info and opinions about it related with Mono.Nat. I hope you find them useful.
Merge pull request #891 from lontivero/patch-1

Update ExternalPortForwarding.cs
update translations
implement removing from playlists
add collages for playlists
Merge branch 'master' of https://github.com/MediaBrowser/MediaBrowser