.travis: added code checker

Author: dg

.travis.yml

@@ -10,7 +10,9 @@ matrix:
     allow_failures:
         - php: hhvm
 
-script: vendor/bin/tester tests -s -c tests/php-unix.ini
+script:
+    - vendor/bin/tester tests -s -c tests/php-unix.ini
+    - php code-checker/src/code-checker.php -d src
 
 after_failure:
     # Print *.actual content
@@ -20,5 +22,6 @@ services:
     - memcached
 
 before_script:
-    # Install Nette Tester
+    # Install Nette Tester & Code Checker
     - composer install --no-interaction --dev --prefer-source
+    - composer create-project nette/code-checker code-checker ~2.2 --no-interaction --prefer-source