travis: PHP 5.6, 7.0 nightly added, 5.3 dropped
travis: PHP 5.6, 7.0 nightly added, 5.3 dropped

To be compatible with composer: https://github.com/doctrine/DoctrineORMModule/blob/51c64bfc5a87148379a03139e0c986c09c81d6af/composer.json#L36

Bash syntax cleanup
Chhunlong/DoctrineORMModule,Diego-Brocanelli/DoctrineORMModule,mpalourdio/DoctrineORMModule,Perfect-Web/DoctrineORMModule,Diego-Brocanelli/DoctrineORMModule,eminetto/DoctrineORMModule,basz/DoctrineORMModule,eminetto/DoctrineORMModule,gencer/DoctrineORMModule,tommyseus/DoctrineORMModule,tommyseus/DoctrineORMModule,assessfirst/DoctrineORMModule,Chhunlong/DoctrineORMModule,assessfirst/DoctrineORMModule,tommyseus/DoctrineORMModule,assessfirst/DoctrineORMModule,Chhunlong/DoctrineORMModule,doctrine/DoctrineORMModule,Diego-Brocanelli/DoctrineORMModule,gencer/DoctrineORMModule,doctrine/DoctrineORMModule,mpalourdio/DoctrineORMModule,basz/DoctrineORMModule,jenniferyien/DoctrineORMModule,eminetto/DoctrineORMModule,Perfect-Web/DoctrineORMModule,basz/DoctrineORMModule,jenniferyien/DoctrineORMModule,jenniferyien/DoctrineORMModule,gencer/DoctrineORMModule,Perfect-Web/DoctrineORMModule,doctrine/DoctrineORMModule,mpalourdio/DoctrineORMModule