Add Doctrine Coding Standards in tests

[franmomu]

Q	A
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	-
License	Apache2

Description

I basically copied more or less the structure of Travis and PHPCS from https://github.com/schmittjoh/serializer.

I added doctrine/coding-standard package and I also only added Tests folder to check the CS. After getting this working, I'll add another PR fixing the rest of the code.

This is going to fail as it needs to execute phpcbf and fix some tests, but that would be after https://github.com/schmittjoh/JMSTranslationBundle/pull/523.

TODO

• [x] Merge https://github.com/schmittjoh/JMSTranslationBundle/pull/524
• [x] See if https://github.com/schmittjoh/JMSTranslationBundle/pull/526 fix test issues
• [x] Address CS issues

[goetas]

hmm, the github merge broke something... can you please take care of ?

[goetas]

huge thanks!