Fix #336 and #349

Move nuget for fsautocomplete into the project files. Use SolutionDir so that FSharp.CompilerBinding can load FCS no matter whether we are in fsautocomplete or Monodevelop.FSharpBinding.

Upgrade nuget to 2.7 so that we can install without consent.

Add app.config so that it a windows build runs without a typeloadexception.

Fix a nasty bug in monodevelop binding whereby references would not be resolved correctly if they needed to go through MSBuild e.g. if they contain $(SolutionDir)