Revert "Uncomment python dependencies." (closes #654)

This reverts commit dce76d35f8.

It is really CRAPPY to add a hard dependencies to optional things like
PyQt.

setup.py

@@ -200,20 +200,20 @@ setup(
     data_files=data_files,
 
     install_requires=[
-        'ClientForm',
+        # 'ClientForm', # python-clientform
-        'elementtidy',
+        # 'elementtidy', # python-elementtidy
-        'FeedParser',
+        # 'FeedParser', # python-feedparser
-        'gdata',
+        # 'gdata', # python-gdata
-        'html5lib',
+        # 'html5lib', # python-html5lib
-        'lxml',
+        # 'lxml', # python-lxml
-        'Mako',
+        # 'Mako', # python-mako
-        'mechanize',
+        # 'mechanize', # python-mechanize
-        'PIL',
+        # 'PIL', # python-imaging
-        'PyQt',
+        # 'PyQt', # python-qt4
-        'python-dateutil',
+        # 'python-dateutil', # python-dateutil
-        'PyYAML',
+        # 'PyYAML', # python-yaml
-        'Routes',
+        # 'Routes', # python-routes
-        'simplejson',
+        # 'simplejson', # python-simplejson
-        'WebOb',
+        # 'WebOb', # python-webob
         ],
 )