fixed a minor issue in bootstrap of tests
replaced require with include as phpcs complained
use version of phpunit that's specified in composer.json
use phpunit 3.7.x to have php 5.3.x compatibility
added CodeSniffer's syntax check as part of travis tests
added php 5.5 to testing enviroments
Merge branch 'master' of github.com:XaminProject/handlebars.php