PHP Class implementation of LZ-String javascript

Based on the LZ-String javascript found here: http://pieroxy.net/blog/pages/lz-string/index.html

If you plan to exchange your data via AJAX use the base64 methods hence this is HTTP save.

• 2014-05-09 Added support for special chars like é,È, ... [Thanks to @carlholmberg]

• 2014-03-12 Small Bugfix added (Thanks to Filipe)

• 2016-02-04 Overhaul and refactor