xnviewmp.py: Add upstream watcher for XnView MP

The version is not included in the tarball name.
Only exists as text on the download page.
So just parse the text.

xnviewmp.py

@@ -0,0 +1,11 @@
+#!/usr/bin/python
+import re
+import urllib2
+import sys
+h=urllib2.urlopen("http://www.xnview.com/en/xnviewmp/").read()
+v_finder=re.compile('Download <strong>XnView MP (?P<version>[\d\.]+) :</strong>', re.M)
+m=v_finder.finditer(h)
+if not m: sys.exit()
+for x in m:
+	v=x.group("version")
+	print "<a href='http://www.xnview.com/en/xnviewmp/%s'>%s</a>"%(v,v)