Added Roslyn Completion Service#1534

Merged

OmarTawfik merged 4 commits intodotnet:roslynfrom

OmarTawfik:roslyn-completion

Sep 15, 2016

Commits on Sep 9, 2016

Added completion service + ShouldTriggerCompletion
Omar Tawfik
committed

Commits on Sep 10, 2016

Added GetDescriptionAsync()
Omar Tawfik
committed

Commits on Sep 14, 2016

Fix tests
Omar Tawfik
committed
Added FSharpCompletionProviderTests
Omar Tawfik
committed