[#5285] Updated postmarkup version

Fix for http://code.google.com/p/postmarkup/issues/detail?id=37
From https://sourceforge.net/u/masterbunnyfu/postmarkup/

Signed-off-by: Cory Johns <johnsca@geek.net>
diff --git a/requirements-sf.txt b/requirements-sf.txt
index 251f89f..e852a39 100644
--- a/requirements-sf.txt
+++ b/requirements-sf.txt
@@ -15,7 +15,7 @@
 html2text==3.200.3dev-20121112
 
 # for the migration scripts only
-postmarkup==1.2.0
+postmarkup==1.2.0dev-20121114
 # suds needed for teamforge import script
 suds==0.4
 mediawiki==0.0.1