Merge pull request #901 from mispencer/CygwinDllNameLocation

Cygwin dll extension and installation
Support cygwin test compilation
Better logging for OmnisharpServer failures
Expose Omnisharp's GoToImplementation command
Support for SyntaxErrors in Omnisharp completer
Csharp goto was off one column and line
Add GoToImplementationElseDeclaration completer command for csharp completer
Crude razor support
Remove Omnisharp server logs on shutdown if server_keep_logfiles is false