Make greg work with broken enclosure links

Taken from
http://stackoverflow.com/questions/120951/how-can-i-normalize-a-url-in-python,
referring to http://bugs.python.org/issue918368.

Enclosure links with spaces in them were causing greg to fail when
attempting to download them, or store them in the list of seen
enclosures. This fix uses 'quote' from 'urllib' to replace funny
characters in the url with escape sequences. I.e. " " becomes "%20".

greg/greg.py

@@ -27,6 +27,7 @@
 from itertools import filterfalse
 from urllib.request import urlretrieve
 from urllib.parse import urlparse
+from urllib.parse import quote
 from urllib.error import URLError
 from lxml import etree as ET
 
@@ -291,8 +292,10 @@ def download_entry(self, entry):
         downloaded = False
         ignoreenclosures = self.retrieve_config('ignoreenclosures', 'no')
         notype = self.retrieve_config('notype', 'no')
+        # Clean up urls
         if ignoreenclosures == 'no':
             for enclosure in entry.enclosures:
+                enclosure["href"] = quote(enclosure["href"], safe="%/:=&?~#+!$,;'@()*[]") #Clean up url
                 if notype == 'yes':
                     downloadlinks[urlparse(enclosure["href"]).path.split(
                         "/")[-1]] = enclosure["href"]
@@ -313,6 +316,7 @@ def download_entry(self, entry):
                               "option in your greg.conf", file=sys.stderr,
                               flush=True)
         else:
+            entry.link = quote(entry.link, safe="%/:=&?~#+!$,;'@()*[]")
             downloadlinks[urlparse(entry.link).query.split(
                 "/")[-1]] = entry.link
         for podname in downloadlinks: