Updated composer.json and Module.php

- upgraded to Opauth 0.4.4
- now using autoload psr-0 namespace mapping
- changed position of Module.php code to reflect composer.json changes
Deleted unneeded files
Updated Readme

- Added info on how to install LfjOpauth and Opauth strategies using
composer
- Added info on how to enable LfjOpauth module to the Zend Framework 2
application
- Fixed links and typos