Fix horizon.tables.Column __init__ method.

__init__ method currently does not work (raises an exception)
when 'transform' arg is callable and 'verbose_name' arg is absent.
Fixed __init__ to use "" as default for 'verbose_name' when
'transform' is callable.

Change-Id: I45c7cd4502e7ea8c809f05ff0ed70b4f766c17fd
Closes-bug: #1230400
Updated from global requirements

Change-Id: I1c8faf25d2d4dcd95f76fd0744a7906e7210615c
Fix warning in run_tests.sh --makemessages

Specify --extension=html,txt,csv only for openstack_dashboard.
For djangojs, --extension should be 'js'.
This is the cause of the warning.

Change-Id: Ia5ac03fa82c18356b8d210005f8696ae148981bd
Closes-Bug: #1243526
Merge "Fix horizon.tables.Column __init__ method."
Merge "Fix warning in run_tests.sh --makemessages"
Merge "Updated from global requirements"