Fix processing angle quotes in smarty extension

[mitya57]

I have got the following bug report privately:

>>> import markdown
>>> from markdown.extensions.smarty import SmartyExtension
>>> md = markdown.Markdown(extensions=[SmartyExtension(smart_angled_quotes=True)])
>>> md.convert("<<hello>>")
'<p>&lt;<hello>&gt;</p>'

(Expected result will be '<p>&laquo;hello&raquo;</p>').

This pull request fixes it. @waylan: I have not pushed it directly because you may know better ways to fix it, than separating the processors. If I just move everything to before inline, then I get the Python-Markdown internals leaking into the resulting HTML.

[waylan]

Looks fine to me. Thanks.

[mitya57]

Oops, now that regex seems to match even text inside code blocks :-(

I will try to look at that in the coming days, in the mean time suggestions on how to fix this are appreciated.

The issue is not that severe because smart_angle_quotes is disabled by default.