Pull the memcache interaction code into cache.py.
Adds sum of all WP donations to the dashboard
Update democracy.com and WP totals
Adding the sum makes the admin page time out, temporaray fix.

Revert "Adds sum of all WP donations to the dashboard"

This reverts commit 9f8d8e3ef7495836f9ed9b3158307d56f71a4be8.
fix progress bar for over 100%
Add another page to the Paypal process.

By doing authorization only, Paypal expects the flow to include
a return to the 'merchant' page (i.e. us).  Given that, we add
a paypal-return page and have the user confirm their pledge.

Signed-off-by: Jeremy White <jwhite@codeweavers.com>