Generate an APC prefix based on __FILE__

Closes #654
updated version to 2.6
Ignore phpunit.xml

...as recommended in http://symfony.com/doc/current/book/testing.html#phpunit-configuration
Merge branch '2.5'

* 2.5:
  updated PHPUnit configuration (added XSD, removed defaults, proper formatting)
  fixed symfony deps
  fixed symfony deps
  bumping Symfony to 2.5 stable
  bumping SensioDistributionBundle dep

Conflicts:
	composer.json
Merge branch '2.5'

* 2.5:
  License year range updated
minor #663 Add phpunit.xml to .gitignore (nicwortel)

This PR was merged into the 2.6-dev branch.

Discussion
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Add phpunit.xml to .gitignore

[The documentation](http://symfony.com/doc/current/book/testing.html#phpunit-configuration) recommends ignoring `phpunit.xml`, and only committing `phpunit.xml.dist` in version control.

This PR adds `/app/phpunit.xml` to the `.gitignore` that comes with the Symfony Standard distribution.

Commits
-------

9053b6b Ignore phpunit.xml
removed Travis configuration
Merge branch '2.3' into 2.4

* 2.3:
  removed Travis configuration
Merge branch '2.4' into 2.5

* 2.4:
  removed Travis configuration

Conflicts:
	.travis.yml
Merge branch '2.5'

* 2.5:
  removed Travis configuration
  updated VENDORS for 2.5.1
feature #657 Generate an APC prefix based on __FILE__ (trsteel88)

This PR was merged into the 2.6-dev branch.

Discussion
----------

Generate an APC prefix based on __FILE__

Closes #654

Commits
-------

3be1eee Generate an APC prefix based on __FILE__
Merge update from symfony 2.5