let zf2 console return exit status
let zf2 console return exit status

Creating and returning a ConsoleModel with its error level set
results in ZF2 exiting with the given exit code. Without this,
`php public/index.php <command>` always exits with status 0,
aka success.
UFOMelkor/DoctrineModule,marek1989/DoctrineModule,malukenho/DoctrineModule,vasildakov/DoctrineModule,netiul/DoctrineModule,malukenho/DoctrineModule,UFOMelkor/DoctrineModule,mpalourdio/DoctrineModule,inbaz/DoctrineModule,alirezarahmani/DoctrineModule,gencer/DoctrineModule,doctrine/DoctrineModule