Add capability with zepto, add demo file, expand short variables

* remove tailing spaces and convert tabs to spaces
* expand variables short => meaningful
* add `$.fn.colResizable.tables` for debuging
* add support for zepto (works with some extra script for innerWidth/outerWidth, data.js detect.js), I convert `:first` selectors to `:first-child` and remove leading ">" so it not support tables with nested tables
* romove shortcuts for `Math` and `parseInt`