Make NuGet.proj and build.bat work in project path containing spaces.

`build.bat` does not work when NuDoc is located in a path containing spaces.  Change the following to fix this:

* Quote DropDirectory and remove trailing slash as advised here http://nuget.codeplex.com/workitem/901
* Quote NuGetExe.
* Quote NuGet.proj path in build.bat.

*Also, add ignore for R# dotsettings file.*

All tests passed bar one relying on Win8 as I'm on Win2008.