Fixed channel path to work with Ghost-CLI

- Just, DERP 🙈

core/server/services/channels/loader.js

@@ -1,5 +1,6 @@
 var debug = require('ghost-ignition').debug('channels:loader'),
     _ = require('lodash'),
+    path = require('path'),
     Channel = require('./Channel'),
     channels = [];
 
@@ -10,7 +11,7 @@ function loadConfig() {
     // If you are reading this code, and considering using it, best reach out to us on Slack
     // Definitely don't be angry at us if the structure of the JSON changes or this goes away.
     try {
-        channelConfig = require('../../../../config.channels.json');
+        channelConfig = require(path.join(process.cwd(), 'config.channels.json'));
     } catch (err) {
         channelConfig = require('./config.channels.json');
     }