Add a target for makeing a cloud db; #415
Add a target for makeing a cloud db; #415

This hits api.postgression.com and writes the result to DATABASE_URL in
local.env. There is no error checking (last week postgression was giving
me a "none available" error message for a while). Also, postgression
instances only live for 30 minutes, which isn't great for the dev use
case.

mccolgst/www.gittip.com,eXcomm/gratipay.com,gratipay/gratipay.com,studio666/gratipay.com,bountysource/www.gittip.com,eXcomm/gratipay.com,eXcomm/gratipay.com,mccolgst/www.gittip.com,gratipay/gratipay.com,mccolgst/www.gittip.com,gratipay/gratipay.com,studio666/gratipay.com,bountysource/www.gittip.com,bountysource/www.gittip.com,studio666/gratipay.com,studio666/gratipay.com,bountysource/www.gittip.com,gratipay/gratipay.com,mccolgst/www.gittip.com,eXcomm/gratipay.com