Add listLanguages() API methods and fix export.html
Update sql.js

keywords: limit, ifnull
Merge pull request #378 from neor-ru/patch-1

Update sql.js
fix language class detection
Add @jenius to AUTHORS.en.txt
Add test for lang- prefixing
Merge pull request #382 from jenius/lang-patch

closes #380
Added common global objects to JavaScript, removed one from CoffeeScript. Should fix #381.
Merge pull request #359 from Sannis/fix_export_html

Add listLanguages() API methods and fix export.html