remove duplicate promise module in av-browser-core

Author: aisk

lib/av-browser-core.js

@@ -24,7 +24,6 @@ require('./geopoint')(AV);
 require('./acl')(AV);
 require('./op')(AV);
 require('./relation')(AV);
-require('./promise')(AV);
 require('./file')(AV);
 require('./object')(AV);
 require('./role')(AV);