Improves Configurator

- Improves configurator and tests
Adds remark property to Phrase entity

Also some entity code cleanup
Adds bootstrap-sass and scssphp

Also updates some packages, including Symfony (2.5.6 -> 2.5.7)
Updates to Symfony 2.6 (dev)
Layout and cleanup

- Bootstrap layout
- Minimal css
- Filter so only own books are visible, ever (except for super admin)
- Renames some properties in Phrase entity
- Cleanup
Adds KnpMenuBundle