Updated requirements.txt

requirements.txt

 Django==1.3.1
 GitPython==0.3.2.RC1
 Markdown==2.1.0
+mdx-cite==1.0
+mdx-del-ins==1.0
+mdx-outline==1.02
+mdx-semanticdata==1.0
+mdx-semanticwikilinks==1.0
 PyYAML==3.09
 async==0.6.1
 diff-match-patch==20110725.1
 distribute==0.6.14
 feedparser==5.1
 gitdb==0.5.4
+html5tidy==1.0
 html5lib==0.90
 ipython==0.11
 lxml==2.2.8
@@ -16,3 +22,4 @@ smmap==0.8.1
 virtualenv==1.6.4
 wsgiref==0.1.2
 django-typogrify==1.2.2
+django-registration==0.8
\ No newline at end of file