add php-coveralls to project

Author: adriangibbons

.travis.yml

@@ -2,6 +2,10 @@ language: php
 php:
   - 5.5
 
+before_script:
+  - curl -s http://getcomposer.org/installer | php
+  - php composer.phar install --dev --no-interaction
+
 script:
   - mkdir -p build/logs
   - phpunit tests --coverage-clover build/logs/clover.xml