Multi-service support

[zuavra]

Maintain multiple whitelists, so that one install can be used for multiple distinct services.

• Indicate the whitelist on URL: /validate/?WHITELIST-NAME.
• Maintain multiple whitelists internally (store of stores).
• Expand /status interface to deal with multiple whitelists.
• Perhaps add ability to kill an entire whitelist to /status (/kill?)

[zuavra]

Implemented in v1.4.0.