RWBM microsite settings for location/privacy
Make poster.cgi aware of rwbm exception for SMS

This fixes #70, or rather the root reason that ticket was logged:
we don't want the flyers to refer to SMS, as we're not using that
for RBWM.  Instead of disabling the whole feature, we flesh out
the stubbed 'has_sms' function, and the PDF generation routine
already does the right thing here.
Update list of popular social networking sites

Welcome to Web 2.0, please drive carefully.
Replaces #84
Removed padding from rss links
use a RBWM colour for the start pledge button
Remove border from govmetric box
tweak to colours to be more like RBWM
correct positioning of start button
chasing down and replacing more colours
Merge remote-tracking branch 'origin/rbwm-moderation' into rbwm-ui