add travis integration

[agallou]

Runs PHPCS on travis.

cf #59

[woecifaun]

@agallou do you have your PHPCS fixed?

when I run bin/coke on master branch, I still have the multiline signature issue.

FILE: ...UP/HaphpyBirthdayBundle/Form/Converter/ContributionConverter.php
----------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
----------------------------------------------------------------------
 40 | ERROR | [x] Opening brace should be on a new line
----------------------------------------------------------------------
PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
----------------------------------------------------------------------

Vendor versions

m6web/coke                           v2.1.0
m6web/symfony2-coding-standard       v3.0.0
squizlabs/php_codesniffer            2.3.3

[woecifaun]

Otherwise I think it's a great idea to have it run automatically. Thanks.

[woecifaun]

Here it is.

The @M6Web Symfony2 Coding Standards lost its compatibility to multiline function signature when updating Symfony2 coding standard to PHP_CodeSniffer v2 interface.

I made a PR to fix it. BedrockStreaming/Symfony2-coding-standard#11