Move "Other Receiving Options" to Accounts tab.

Discussed here: https://github.com/gittip/www.gittip.com/pull/2323#issuecomment-41604289

Yes, it's only copy-paste, but this is my first "real" Gittip contribution where I had to figure out a bit about Aspen, so be gentle (and suspicious) :)

cc: @clone1018