Add basic http auth support to mailcatcher

[yanks]

Just added some commandline options and added a http auth filter in sinatra. We need this for some staging servers that have internet facing IPs.

Thanks for the sweet gem man!

[sj26]

Hi there!

Apart from the websocket hole, I'm not keen on adding authentication support explicitly to the project. I'd like to keep the application itself simple, and it's intended to be run by a developer on a single machine.

I'd suggest firewalling and proxying the application (with something websocket enabled like Pound) if you have such a requirement.

An alternative would be to customise the MailCatcher startup script a little and insert your own authentication middleware into the stack, pretty sure Rack provides some standard some-such which should work.