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 a multitude of Forth file extensions.
Yes, these are all in use.
Add Groff sample.
Update samples.json.
Make test_pedantic accept quotes around extensions.