The newline inside equation is good for Latex but not for VisualEditor

\begin{equation} \int_{\gamma_s}f(z)\,\rd z \to \int_{\gamma_0}f(z)\,\rd z\mbox{ as }s\to 0. \end{equation}

is traslated to

<math display="block">\int_{\gamma_s}f(z)\,\mbox{d} z \to \int_{\gamma_0}f(z)\,\mbox{d} z\mbox{ as }s\to 0.</math>

but the newline among the curly brackets breaks VE

To complete this task modify the **MathCheck.py** to remove \n from inside math environments.

Please pull request your changes.