Added PSR2 check

.travis.yml

@@ -23,6 +23,7 @@ before_script:
   - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
 
 script:
+  - vendor/bin/phpcs --standard=psr2 src/
   - vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
 
 after_script:

composer.json

@@ -20,7 +20,8 @@
     },
     "require-dev": {
         "phpunit/phpunit" : "4.*",
-        "scrutinizer/ocular": "~1.1"
+        "scrutinizer/ocular": "~1.1",
+        "squizlabs/php_codesniffer": "~2.3"
     },
     "autoload": {
         "psr-4": {