Updated mime types to be more detailed

Commented out two unused stock icons
Merge pull request #305 from 7sharp9/master

Updated mime types to be more detailed
First stage of changes to decouple the Language service from monodevelop
Added null check to project
Updated to FSharp.Compiler.Service 0.0.11
Moved Language Service to CompilerBinding
Modified Services to use moved LanguageService
Switched to lazy keyword rather than Lazy.Create
Removed lazy initialisation from language service, it added no value here anyway.
Merge pull request #307 from 7sharp9/master

Decouple monodevelop from the language service agent
Fix FSharp.Core resolution issue in the MonoDevelop add-in

The add-in has to resolve mscorlib and FSharp.Core using the
project assembly context.