Update to RTM version of Microsoft.Net.Http library.
Merge remote-tracking branch 'gitextensions/master' into BuildServerIntegration

Conflicts:
	GitUI/CommandsDialogs/FormBrowse.cs
Update ref to _currentFilesList after unstage all
Keep selection on last staged/unstaged file
Fixed selection when staging/unstaging selected lines.
Merge remote-tracking branch 'gitextensions-pombeiro/BuildServerIntegration' into BuildServerIntegration
Merge remote-tracking branch 'gitextensions/master' into BuildServerIntegration