Change release version to 2.3

We do have breaking changes in the form of new namespace and some parameter re-ordering. These seem to indicate we should move to 3.0.*, but we will move to 2.3.* for now until we finalize plans.
Use new repo name for doc generation
Set correct website name.
Fix Travis CI build status badge
Update AssemblyInfo
Fix documentation generation.
Update generated documentation for version 2.3.0-beta
Update generated documentation for version 2.3.0-beta
Fix documentation generation.
Progress toward generating docs
add paket
remove nuget restore packages
fix build and fsharp formatting references
Generate docs only on demand
Update to latest FSharp.Compiler.Service