fixed: ProjectProvider.CompilerOptions fails if there are empty references
update FSharp.Compiler.Services to 0.0.22

uncomment LanguageService tests related to find usages of generic parameters and statically resolved type parameters
Merge pull request #97 from vasily-kirichenko/master

fixed: ProjectProvider.CompilerOptions fails if there are empty references & update FSharp.Compiler.Services to 0.0.22