[FIX] Wrap werkzeug.utils.escape() to accomodate signature change in 0.9

We always want to escape quotes (") as part of the process of
generating HTML output. This option (quote=True) turned into
an implicit flag with a DeprecationWarning in werkzeug 0.9.0
It is likely to disappear in a future release of werkzeug too.
A wrapper avoids this warning without loss of compatibility