Fix typos in add_gittip_user.sql
Fix typos in add_gittip_user.sql

1 - It's "usename", not "username" :(
2 - Create gittip role, not 'vagrant'
3 - Make it a superuser

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