remove mail domain add/remove API

merge this as a transaction into domains API

fixes #669

src/test/apptask-test.js

@@ -18,6 +18,7 @@ var addons = require('../addons.js'),
     net = require('net'),
     nock = require('nock'),
     paths = require('../paths.js'),
+    settings = require('../settings.js'),
     userdb = require('../userdb.js'),
     _ = require('underscore');
 
@@ -119,6 +120,7 @@ describe('apptask', function () {
         async.series([
             database.initialize,
             database._clear,
+            settings.setAdmin.bind(null, DOMAIN_0.domain, 'my.' + DOMAIN_0.domain),
             domains.add.bind(null, DOMAIN_0.domain, DOMAIN_0, AUDIT_SOURCE),
             userdb.add.bind(null, ADMIN.id, ADMIN),
             appdb.add.bind(null, APP.id, APP.appStoreId, APP.manifest, APP.location, APP.domain, APP.portBindings, APP)