Rename dictionary file javascript-mode -> js-mode

'javascript-mode' is only alias of 'js-mode' from Emacs23.2.
Merge pull request #347 from gcd0318/master

add more words to python dict
Add less-css-mode to ac-modes
Add web-mode to ac-modes
Merge pull request #332 from auto-complete/rename-javascript-dictionary

Rename dictionary file javascript-mode -> js-mode
Merge pull request #1 from auto-complete/master

sync from origin