Make controller generation compatible w/ Symfony 2.3 and add autocompletion-support

- Fix crud-generation in symfony 2.3.x
- Fix auto-completion for entities
- Name generator templates consistently
- Make detection of bundles in "src" directory more stable and cross-platform compatible
- Look for overridden templates in the "HydraBundle" folder not "SensioGeneratorBundle"
- Restore the original URL prefix and route name handling
- Do not automatically create "Resources/views/" directory - it's not needed

This closes PR #2, thanks to Benjamin for his contributions.