use TwitterAccount's get_url instead of custom html_url

This resolves #1997 by using what we have instead of relying on a
derivative value from the database (that happened to be blown away by
#1989)
Merge pull request #2001 from gittip/1997-fix-twitter-links

use TwitterAccount's get_url instead of custom html_url
Bump version to 11.2.15
Bump version to 11.2.15-dev
Replace '==' with '='.
My fingers keep typing 'bin'.
A way to restore db dump super fast.
Merge pull request #2003 from gittip/fix-release

Replace '==' with '='.
Merge pull request #2005 from gittip/restore-dump

Restore dump
properly initialize tips JS on elsewhere profile pages

resolves #2004
standardize on `if not locked` for tips JS initialization

it turns out that Twitter wasn't checking if the given account was
locked :o
fix leak of received amounts
Merge pull request #2007 from gittip/2004-tips-js

properly initialize tips JS on elsewhere profile pages
Bump version to 11.2.16
Bump version to 11.2.16-dev
Merge pull request #2009 from gittip/fix-anonymous-receiving

fix leak of received amounts
Add a script to setup a PayPal email address
Merge pull request #2012 from gittip/set-paypal-script

Add a script to setup a PayPal email address
Update PGP key

My PGP key expired on Feb 1. I set the expiration time forward another
year. Here's the new public key.
Merge pull request #2017 from gittip/update-pgp-key

Update PGP key