update to FCS 0.0.11, publicOnly, perf improvements

- Update to FSharp.Compiler.Service 0.0.11 (fixes #91)
- add a "publicOnly" option (defaults to "false" like before), much faster for generating FSharp.Compiler.Services docs
- give a Razor cache name (doesn't seem to make much difference to perf though)

This reduces run time for generating FSharp.Compiler.Service docs from 800sec to 250sec. Still a bit long though!