F# better typeparam handling

 * Still doesn't handle 'when' or 'static member' constraints.
 * Sample code from Colin's FSharp.Actors project.
Merge branch 'feature/better-typeparams-fsharp' of github.com:haf/highlight.js into fsharp

Conflicts:
	AUTHORS.en.txt
	classref.txt
	src/languages/fsharp.js
Trim F# snippet.
Define F# type params in type titles only.
Reset relevance of F# keywords.
Adding Henrik Feldt to AUTHORS.ru.txt
Added STEP Part 21 (ISO 10303-21) support