Added defaults for more toolbar buttons
Added defaults for more toolbar buttons

vladson/simplemde-markdown-editor,arduanov/simplemde-markdown-editor,vijos/vj-simplemde,leeoniya/simplemde-markdown-editor,sparksuite/simplemde-markdown-editor,nofxx/simplemde-markdown-editor,cesarmarinhorj/simplemde-markdown-editor,minton/simplemde-markdown-editor,pronebel/simplemde-markdown-editor,LulzAugusto/simplemde-markdown-editor,tiltandco/simplemde-markdown-editor,Baekjoon/simplemde-markdown-editor