Add coveralls

Author: estahn

.travis.yml

@@ -27,3 +27,6 @@ after_script:
   - php vendor/bin/codacycoverage clover build/logs/clover.xml
   - wget https://scrutinizer-ci.com/ocular.phar
   - php ocular.phar code-coverage:upload --format=php-clover build/logs/clover.xml
+  - bash <(curl -s https://codecov.io/bash) -f build/logs/clover.xml
+  - wget https://github.com/satooshi/php-coveralls/releases/download/v1.0.0/coveralls.phar
+  - php coveralls.phar --coverage_clover=build/logs/clover.xml