Travis: Initiating build for commit '9e9b3cbd3c56e0aabe0e8b08456381daab984481': Merge pull request #110 from piwik/log

Rewrite logging in Piwik and remove Zend_Log
goal: logging easily reusable by plugin developers. The next step will be to allow developers to easily view the logs, Log Viewer UI is in http://dev.piwik.org/trac/ticket/2473 (would be useful to view eg. archive.php frequency&exec times)