Removing the plugins from the CMS Core and putting them into separate repos instead

New plugins are located here:
* https://github.com/divio/djangocms-file
* https://github.com/divio/djangocms-flash
* https://github.com/divio/djangocms-googlemap
* https://github.com/divio/djangocms-inherit
* https://github.com/divio/djangocms-picture
* https://github.com/divio/djangocms-teaser
* https://github.com/divio/djangocms-video