fix(yandexService): Fixed issue with parsing yandex values containing…

… '/'

Yandex output sometimes contained '/' character (eg. to mark alternative translations). This
caused issues because this character was also used as text separator (hash). Changing separator
to '@@@' resolves problems.

#22

lib/service/yandex.js

@@ -1,7 +1,7 @@
 var Promise = require('promise');
 var _ = require('lodash');
 
-var hashSimple = '/|/|/|';
+var hashSimple = '@@@';
 var translateService;
 
 function init(setting) {