automatic tags generator
split regex
basic refactoring, template tags, javascript changed
auto update tags
Comments added
update assets with new tags on object save
Fix template
Merge branch 'develop' into feature/tags_update

Conflicts:
	scarlet/cms/source/js/admin/modules/AssetSelect.js
	scarlet/cms/views.py
Refactor of auto tagging
Patch the vary headers for cacheviews
Use cache middleware prefix if available
Add readonly fields
fixed grammar in docs
Test for empty values the django way
Truncate log messages
Unregister primary bundles automatically
Avoid context conflict in accounts
Removed unused imports and fixed line lengths and spaces convention
Removed unused imports and fixed line lengths and spaces convention
Removed unused 'old_value' inside the save function of the Asset