"edit with emacs" integration

Done :D

this is a patch for drutex 6.x-1.0-beta1

you can use any of this

\begin{align}
...
\end{align}

\begin{align*}
...
\end{align*}

\begin{align}% id="eqname"
...
\end{align}

\begin{align}
\label{eqname}
...
\end{align}

please consider including this patch in the next version, and including directives in the documentation.

Thank you