Stop menu view controllers from scrolling.
Fix menu popover size on iPad.

Matches existing behavior on smaller devices.
Don't leave popover orphaned when showing original on iPad.
Show Send To in a popover on iPad.

UIActivityViewController should not be presented modally on iPad, per the documentation; it also looks pretty ugly.

Also clean up display of training popover to eliminate shadow fading in background.
Adding permalink blurblog option. Also adding feed title to unmessaged shares.
Moving goodies images out of css. New ReadKit image.
Fixing a couple exceptions and turning off google news rss feeds temporarily.
Skipping google alerts.
Merge pull request #400 from nriley/popovers

iPad popover fixes
Clarifying API.
Fixing iOS issue on river terminating prematurely.
Fixing premium interval in statistics.
Re-enabling Google News fetches.