fix latex2edx so it leaves div alone if not in class minipage
fix latex2edx so it leaves div alone if not in class minipage

evheubel/latex2edx,mitocw/latex2edx,evheubel/latex2edx,jefrench/latex2edx,jefrench/latex2edx,jefrench/latex2edx,mitocw/latex2edx,mitocw/latex2edx,evheubel/latex2edx