Implement BREAD generator (or some kind of rapid development setup tool)

[leevigraham]

• https://github.com/sensiolabs/SensioGeneratorBundle
• https://github.com/Sylius/SyliusResourceBundle
• https://github.com/jordillonch/CrudGeneratorBundle
• http://www.ricardclau.com/2012/03/extending-sensiogeneratorbundle-for-our-admin-areas/