Add knockout.js library as vendor file
Lexer for Handlebars
Remove file extensions with multiple segments
Merge pull request #1437 from pchaigno/handlebars-lexer

Lexer for Handlebars
Merge pull request #1438 from pchaigno/file-extensions

Remove file extensions with multiple segments
Merge pull request #1433 from pchaigno/knockout.js

Add knockout.js library as vendor file
Add FORTRAN samples.
Add Forth extensions .f and .for; add heuristics for Forth and FORTRAN.
Update samples.json.