Release 0.24.0

Added:

1. added embedded_cart module that allows posting links to product purchase on other websites
2. added option to use products category in pim_rotator

Improvements:

1. delivery cost tax rate calculation
2. update stats collecting and displaying in admin panel
3. improve sizing of wysiwyg editor
4. move test mode setting to core config
5. add more font sizes to wysiwyg
6. added font properties to theme configuration

Bugfixes:

1. fix admin form error handling bugs
2. fix saving parent title in categories
3. fix clearing of admin columns on store update
4. hide sensitive fields from api data (virtual products)