minor #663 Add phpunit.xml to .gitignore (nicwortel)
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
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9053b6b Ignore phpunit.xml

ewgRa/symfony-standard,tristanbes/symfony-standard,ovelasquez/ussi,propelorm/symfony-propel-edition,vincentaubert/symfony-standard,aerrasti/iemedebe,formapro-forks/api-basic,uttam-vi/pardawala,debruyne0/symfony,fahadonline/sulu,NoUseFreak/StandardEdition,NoUseFreak/StandardEdition,unewochialat/symfony-standard,platformsh/platformsh-example-symfony,GulDmitry/music-diff,UxorialRook/symfony-standard,shadowtje1990/symfony_todo_api,apnet/symfony-standard-edition,1ed/symfony-standard,lyrixx/symfony-standard,HasClass0/standard-edition,skafandri/blog,fduch/symfony-standard-workflow,liip-forks/symfony-standard,papaavola/symfony-standard,RuntyCybin/symfony-standard,Spea/symfony-standard,continuousphp/symfony-skeleton,jakzal/symfony-standard,ucay/Skeleton,rajkamalganeshvivid/symfony-standard,Cartesia/01,ewgRa/symfony-standard,WolfMicrosystems/symfony-wms,Tobion/symfony-standard,symfony-cmf/standard-edition,fduch/symfony-standard-workflow,Baachi/symfony-standard,xiaobudongzhang/symfony-standard,xabbuh/symfony-standard,fabpot/symfony-standard,phospr/symfony-starter,aerrasti/iemedebe,b00giZm/symfony-boilerplate-app,ovelasquez/ussi,uttam-vi/pardawala,GulDmitry/music-diff,propelorm/symfony-propel-edition,simonjcarr/symfony_rest,stof/symfony-standard,RuntyCybin/symfony-standard,black-project/black-standard,taylankasap/symfony-standard,fahadonline/sulu,0mars/symfony-standard-issue-13291,the-software-factory/superhero-api,sulu-io/sulu-standard,SymfonyId/api-platform,the-software-factory/superhero-api,MatthieuCutin/ligue-squash,stof/symfony-standard,egeloen/symfony-standard,ybutb/videotask,unewochialat/symfony-standard,egeloen/symfony-standard,skafandri/blog,yelmontaser/symfony-standard,bocharsky-bw/symfony-standard,kmelia/fresh-symfony,orodsem/trout,lyrixx/symfony-standard,fabpot/symfony-standard,apnet/symfony-standard-edition,AlexeyKupershtokh/symfony-standard,Soullivaneuh/symfony-standard,Cartesia/01,mayeco/symfony-standard-pagodabox,vincentchalamon/phpunit-bridge,taylankasap/symfony-standard,b00giZm/symfony-boilerplate-app,by-examples/symfony-standard,sulu-io/sulu-standard,SymfonyId/Skeleton,GulDmitry/music-diff,irro/MastoAlliance,Chill-project/Standard,continuousphp/symfony-skeleton,symfony/symfony-standard,apnet/symfony-standard-edition,pjcdawkins/tmp-symfony-demo,platformsh/platformsh-example-symfony,zanderbaldwin/symfony-layers,ybutb/videotask,ucay/Skeleton,gencer/symfony-standard,vincentaubert/symfony-standard,shamcode/symfony-testing,tristanbes/symfony-standard,gencer/symfony-standard,theodo/theodo-kata,proteichik/testApp,GulDmitry/music-diff,simonjcarr/symfony_rest,symfony-cmf/standard-edition,ctrl-f5/symfony-standard,zanderbaldwin/symfony-layers,bshaffer/symfony-standard,havvg/symfony-propel-edition,formapro-forks/api-basic,Ocramius/symfony-standard,havvg/symfony-propel-edition,continuousphp/symfony-skeleton,orodsem/trout,we-bridge/symfony-admin,symfony/symfony-standard,IgorTimoshenko/symfony-standard-requirejs,bamarni/symfony-docker,spolischook/standard-edition,OskarStark/symfony-standard,jakzal/symfony-standard,Clastic/StandardEdition,orodsem/trout,ucay/Skeleton,kmelia/fresh-symfony,HasClass0/standard-edition,dkarvounaris/symfony-standard,HumanBooster/Symfony,continuousphp/symfony-skeleton,mweimerskirch/symfony-standard,MatthieuCutin/ligue-squash,Rvanlaak/symfony-standard,Tobion/symfony-standard,bionic-university/alexander-pobereznichenko,Cartesia/01,theodo/theodo-kata,wachterjohannes/sulu-standard,glavweb/symfony-standard,havvg/symfony-standard-propel,shamcode/symfony-testing,yelmontaser/symfony-standard,twisted-socket/stage-plots,bshaffer/symfony-standard,ucsf-ckm/symfony-emberjs-edition,glavweb/symfony-standard,kmelia/fresh-symfony,umpirsky/symfony-standard,wachterjohannes/sulu-standard,sulu-io/sulu-standard,Clastic/StandardEdition,ucsf-ckm/symfony-emberjs-edition,papaavola/symfony-standard,dkarvounaris/symfony-standard,fahadonline/sulu,debruyne0/symfony,AlexeyKupershtokh/symfony-standard,Clastic/StandardEdition,havvg/symfony-standard-propel,spolischook/standard-edition,Baachi/symfony-standard,twisted-socket/stage-plots,kosintwong/symfony_test,black-project/black-standard,dunglas/symfony-standard,javiereguiluz/symfony-standard,OskarStark/symfony-standard,Spea/symfony-standard,UxorialRook/symfony-standard,uttam-vi/pardawala,bocharsky-bw/symfony-standard,IgorTimoshenko/symfony-standard-requirejs,vincentchalamon/phpunit-bridge,ctrl-f5/symfony-standard,WolfMicrosystems/symfony-wms,NoUseFreak/StandardEdition,wachterjohannes/sulu-standard,yhoiseth/notelite.net,mkrauser/symfony-dump-demo,Chill-project/Standard,SymfonyId/Skeleton,liip-forks/symfony-standard,aprezcuba24/symfony-standard,proteichik/testApp,mweimerskirch/symfony-standard,shadowtje1990/symfony_todo_api,trsteel88/symfony-standard,Soullivaneuh/symfony-standard,javiereguiluz/symfony-standard,fahadonline/sulu,jbdelhommeau/symfony-standard,bamarni/symfony-docker,jbdelhommeau/symfony-standard,umpirsky/symfony-standard,yhoiseth/notelite.net,ovelasquez/ussi,pjcda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