adopt the plugin-in-plugin to use the new sane add plugin API
Make text plugin sub plugins work with new sane-add-plugin method
use cms_admin_url instead of url
Merge remote-tracking branch 'origin/master' into sane-add-plugin

Conflicts:
	djangocms_text_ckeditor/static/djangocms_text_ckeditor/ckeditor_plugins/cmsplugins/plugin.js
	djangocms_text_ckeditor/templates/cms/plugins/widgets/ckeditor.html
Removed type from script tag
fixed broken {% admin_reverse %}
Merge branch 'sane-add-plugin' of https://github.com/ojii/djangocms-text-ckeditor into ojii-sane-add-plugin
Merge branch 'ojii-sane-add-plugin' into develop