0.8.8.6

• Remove duplicated codes into a mixin
• Add a sample model for testing admin page manually
• Add .flake8 setting
• Rename summer_note to summernote
• Changing the language loading to be synchronous
• View import path fix
• Change class-based view from function-based view
• Add summernote_fields to control which fields will use summernote in admin.
• Fix SummernoteInplaceWidget full screen not work bug.
• Update latest summernote options for __summernote_options__
• Fixes ResizeSensor.js: TypeError: window.getComputedStyle(...) is null

Thank you all contributors!