[FIX] summernote lib: some browsers raise when select a range to target a node like an image or a br; createFromNode can't select a node withe more or less of one item. For eg: <div>text <span>one</span></div> the range selected is only 'text '
[FIX] summernote lib: the prevent default for mousedown image to prevent ie and ff default 'features' must set the range because the cursor is used for edition. This fix allow to remove some code and better selection for dom item.
[IMP] summernote lib: set active/unactive buttons for image edition
[FIX] summernote lib: font size and font color is some time buggy. Create a new function applyFont to remove bugs and to have the same comportment for all browsers. Imp: can use class for color and background color