This details how any dns-based challenge will work with node-letsencrypt, but is not yet implemented specifically (though it is in the pipeline at present, obviously).
Usage
-----
```bash
var leChallenge = require('le-challenge-dns').create({
ttl: 600
, debug: false
});
var LE = require('letsencrypt');
LE.create({
server: LE.stagingServerUrl // Change to LE.productionServerUrl in production
, challenge: leChallenge
});
```
NOTE: If you request a certificate with 6 domains listed,
it will require 6 individual challenges.
Exposed Methods
---------------
For ACME Challenge:
*`set(opts, domain, key, val, done)`
*`get(defaults, domain, key, done)`
*`remove(defaults, domain, key, done)`
For node-letsencrypt internals:
*`getOptions()` returns the internal defaults merged with the user-supplied options
*`loopback(defaults, domain, key, value, done)` should test, by external means, that the ACME server's challenge server will succeed
