Merge pull request #6 from laurafeier/LUN-1507

Browser specific fixes
Added author model to allow users to add authors that are not django users
Merge branch 'master' of github.com:laurafeier/django-cms-blogger
Refactored code for blog categories creation.
Merge pull request #8 from laurafeier/LUN-1507

Fix IE8 tinyMCE initializing after window.load event
Added slug validation for entries;
When an entry queryset gets deleted all the poster images will get deleted from storage;
Moved entry categories logic from admin to entry form.
Merge branch 'master' of github.com:laurafeier/django-cms-blogger
Merge pull request #9 from laurafeier/LUN-1507

Change scroll bar plugin due to lack of license
Merge pull request #10 from laurafeier/LUN-1507

Add missing licenses to plugins
Added tests for Blog model; fixed some issues discovered while writing tests.
Merge branch 'master' of github.com:laurafeier/django-cms-blogger
Added .cache(generated by pep8) to gitignore
Merge branch 'master' into LUN-1507