Merge pull request #150 from Loos/master

Fix ISP upload/download bug & Clean up unused files
Fix authentication error messages.
Merge branch 'master' of github.com:EFForg/OpenWireless
Fork before wifi reload on set_private_ssid.

Ensures the response reaches the browser before the network goes down.
Add Python logout endpoint.
Invalidate auth token on logout.
Add yes/no buttons to logout page.
Implement redirect_after_login.
Use disable-on-submit styling for more pages.
Firewall rule: allow router to send DHCP offers

Previously the DHCP offers to public network clients were getting blocked,
preventing association.
Merge pull request #151 from EFForg/dhcp

Firewall rule: allow router to send DHCP offers
JR & LK - implement checking for router reset
JR & LK - add cron job to run accumulate bytes 1x/hr
merge upstream commits