Rework travis file (#22)

Rework travis file:
* remove composer update because it is done automatically by Travis now
* remove xdebug without test on PHP version to be more versatile
* Update composer.lock
* Add php-cs-fixer
* Apply PSR2 fixes
* Ad composer cache

.gitignore

@@ -1,3 +1,4 @@
 /bin/behat
+/bin/php-cs-fixer
 /bin/phpspec
-/vendor
+/vendor

.travis.yml

@@ -6,22 +6,28 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - 7.1
   - hhvm
 
 matrix:
   allow_failures:
     - php: hhvm
 
+cache:
+  directories:
+    - $HOME/.composer/cache
+
 before_install:
-  - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then phpenv config-rm xdebug.ini; fi
-  - composer selfupdate
+  - phpenv config-rm xdebug.ini || echo "xdebug not available for PHP $TRAVIS_PHP_VERSION"
 
 install:
   - composer --prefer-dist --no-interaction update
 
 script:
   - bin/phpspec run --format=pretty
   - bin/behat
+  - bin/php-cs-fixer --dry-run -v fix src --rules=@PSR2
+
 
 notifications:
   email:

composer.json

@@ -30,7 +30,8 @@
     },
     "require-dev": {
         "phpspec/phpspec": "2.*",
-        "behat/behat": "3.*"
+        "behat/behat": "3.*",
+        "friendsofphp/php-cs-fixer": "@stable"
     },
     "config": {
         "bin-dir": "bin"