[askrover_styling_prune_css] Remove signin links from header.
[askrover_styling_prune_css] Remove copied css in favor of single override file.
[askrover_styling_prune_css] Move css out of new_design directory.
[askrover_styling_prune_css] Remove copied new_design media.
[askrover_styling_prune_css] Add import of overridden style to html header.
[askrover_styling_prune_css] Rework override into single selection rather than nested selectors.
[askrover_styling_prune_css] Remove collapsible div from header (for simplicity).
[askrover_styling_prune_css] Override margin on help link in navbar to align it.
[askrover_styling_prune_css] Remove space from selector.
[askrover_styling_prune_css] Modify user nav: set logout redirect to current page.
[askrover_styling] Merge branch 'askrover_styling_prune_css' into askrover_styling

Conflicts:
	askbot/skins/rover_skin/templates/rover_assets/header.html
	askbot/templates/meta/html_head_stylesheets.html