Implement easy-thumbnail as an alternative backend ?

[sveetch]

Sorl and easy-thumbnail are the two main image resizing libraries.

The second one is very common with a DjangoCMS project, since it is implied in django-filer.

The first is more common every where else, but then it is common to see it as a requirement from a non CMS application into a DjangoCMS project.

However, the two share the same base name for their tag library but does not have the same tag argument syntax, it leads to
conflicts. Hopefully, the two ones have an alternative tag library name to use instead to avoid conflicts.

But finally, easy-thumbnail could be alternative resizer backend so it may help to do a full easy-thumbnail project.

Smart media will have to manage this and especially the different tag argument syntax.