-django<18, +cms3.{2,3,4}, fix cms / all tests

* drop django 1.6 and django 1.7
* add django 1.8
* add django-cms 3.2, 3.3 and 3.4
* remove fixtures to regenerate content for each test
* fix tests for django cms and myall_all
* some code restructuration for test and test apps