Merge pull request #16 from spacepluk/master

get more meaningful errors

lib/moviedb.js

@@ -38,7 +38,7 @@ MovieDB.prototype.requestToken = function(fn){
   .set('Accept', 'application/json')
   .end(function(res){
     if(res.ok) self.token = res.body;
-    else throw new Error('Invalid authentication');
+    else throw res.error;
     fn();
   });