Run tests on older version PHP 5.3.3
Use 5.3 in path to fpm rather than 5.3.3

prevents: https://travis-ci.org/piwik/piwik/jobs/31894699
Check for 5.3* instead of 5.3.3
Merge pull request #5945 from mattab/master

Run tests on older version PHP 5.3.3