bug #759 Add preview error route to dev firewall (pierredup)
bug #759 Add preview error route to dev firewall (pierredup)

This PR was submitted for the 2.7 branch but it was merged into the 2.6 branch instead (closes #759).

Discussion
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Add preview error route to dev firewall

Add the `_error` route to preview error pages to the dev firewall, so you don't have to be authenticated to preview error pages

Commits
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63cb670 Add preview error route to dev firewall

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