Navigation Bars off and Indentation set to Block by default

When you install VS with F#, Navigation Bars are off by default. Indentation is set to Block by default, too. However, this should not be the case. Roslyn is set up to have these be on and Smart, respectively, by default.

**Old issue:**
We don't have an options service that we export to Roslyn, and this results in some settings (e.g., Navigation Bars and Smart Indentation) being given their default by Visual Studio (off and Block mode, respectively). We can implement a [`PerLanguageOption`](http://source.roslyn.io/#Microsoft.CodeAnalysis.Workspaces/Options/PerLanguageOption.cs,ce788e24ff9552f4) for each, export this service, and things should be configured how we need them to be.