Added Comment Sort Direction

Added Comment Sort Direction setting to Advanced Settings > Comments - Display
Functions similar to General Sort Direction (ASC or DESC)
This setting is passed to Quip allowing the content administrator to control the order comments are displayed in on their Article pages
Lexicons have been updated to contain this setting

Let me know if there's anything I can do such additional testing cases.

Screenshot of new setting:
http://j4p.us/image/3p0H1n302K2I
Signed-off-by: JP DeVries <johnpaul.devries@gmail.com>