Allow usage of system Boost libraries
Allow usage of system GTest/GMock libraries
Merge pull request #7 from maksbotan/attempt2

System libraries, second try
Add GoToUsages completer command for CSharp completer
Remove Omnisharp server logs on shutdown if server_keep_logfiles is false
Prevent starting OmniSharp if Omnisharp has already been started
Crude razor support
OmniSharpServer update