Use TextMate 1 scope for HTML+ERB files

The TextMate 2 scope requires support for injection grammars, which some parsers don't support.
Merge pull request #1595 from github/text-html-ruby

Use TextMate 1 scope for HTML+ERB files
Add FORTRAN samples.
Add Forth extensions .f and .for; add heuristics for Forth and FORTRAN.