escaping not handled in NewTextTemplate

[mgood]

& Trying to use the escape method from a text template doesn't seem to work like you'd expect:

>>> from genshi.template import *
>>> from genshi.core import escape
>>> t = NewTextTemplate('${escape(foo)}')
>>> print t.generate(foo='<>', escape=escape)
<>

As a workaround you can force it to a str first:

>>> t = NewTextTemplate('${str(escape(foo))}')
>>> print t.generate(foo='<>', escape=escape)
&lt;&gt;

Admittedly you'll generally want to use Markup templates for HTML generation, but you may want to use the text templates for better performance on certain pages. Also, the bigtable benchmark of NewTextTemplate doesn't do any escaping giving it a slight advantage over the other templates that are calling their escape methods.

[mgood]

fix typo in the description

[cmlenz]

Fixed in [774].