Investigate root .gitignore

[bidi47]

Currently .gitignore has a line for phpunit.xml, so it wasn't pushed in a recent deploy and the phpunit tests failed to run.
Investigate if .gitignore needs to be updated.

[arhimede]

also add on .gitignore the project specific files:
config/autoload/local.php
mail.local.php
debugbar.local.php
development.local.php

[arhimede]

and the folders:
data/cache

[alexmerlin]

also add on .gitignore the project specific files:
config/autoload/local.php
mail.local.php
debugbar.local.php
development.local.php

*.local files are already ignored in this file

[alexmerlin]

and the folders: data/cache

cache directory is already ignored in this file

[bidi47]

resolved in #435