Fix path for case-sensitive file systems.
Merge pull request #54 from jskripsky/master

Fix path for case-sensitive file systems.
AllUsesOfAllSymbols in project/file
add tests, fix type parameter symbol equality
Add symbol uses when abstract slot is implemented
Update version nnumber
Merge branch 'master' of https://github.com/fsharp/FSharp.Compiler.Service
#1 #2 AppVeyor SourceLink