Merge pull request #32 from marcelog/v2.0.0

• No longer depends on log4php
• Logger must now be PSR-3 Compatible
• PSR-4 Autoloading by Composer
• Removed PEAR and PHAR support for distributions
• Available only via Composer
• Uses Travis as CI Server
• Rewrote build system to integrate Travis, Coveralls, and CodeClimate