Rewrite of channel api.

contrib/auto_wizard_example.json

@@ -45,14 +45,21 @@
   ],
   "Channels": [
     {
-      "area": "Email::Inbound",
-      "adapter": "IMAP",
+      "area": "Email::Account",
       "group_id": 1,
+      "options": {
+        "inbound": {
+          "adapter": "imap",
           "options": {
             "host": "mx1.example.com",
             "user": "some user",
             "password": "some pw",
             "ssl": true
+          }
+        },
+        "outbound": {
+          "adapter": "sendmail"
+        }
       },
       "active":false
     }