Downgrade Mercurial wheel to 3.4.2 to restore hg push of Tool Shed repositories. Fix #1183.

lib/galaxy/dependencies/requirements.txt

@@ -3,7 +3,8 @@ bx-python==0.7.3
 MarkupSafe==0.23
 PyYAML==3.11
 SQLAlchemy==1.0.8
-mercurial==3.5
+# Mercurial >= 3.5 changed the bundle format, which breaks hg push of TS repositories
+mercurial==3.4.2
 numpy==1.9.2
 pycrypto==2.6.1
 python_lzo==1.8

lib/tool_shed/util/hg_util.py

@@ -44,7 +44,7 @@ def bundle_to_json( fh ):
     command line) to a json object.
     """
     # See http://www.wstein.org/home/wstein/www/home/was/patches/hg_json
-    hg_unbundle10_obj = readbundle( None, fh, None )
+    hg_unbundle10_obj = readbundle( get_configured_ui(), fh, None )
     groups = [ group for group in unpack_groups( hg_unbundle10_obj ) ]
     return json.dumps( groups, indent=4 )