Update languages.yml

Adding Ox to the list http://www.doornik.com/ox/
Update languages.yml

added explicit lexer
Merge branch 'master' of https://github.com/github/linguist into add-ox
Fix Ox implementation

Remove .h from Ox, fix `lex` typo, and add samples for Ox.
Merge pull request #1228 from christianbundy/add-ox

Add Ox