Do not load un-needed modules

[cjolif]

Un-needed handlers must not be download. A solution would be to use has plugin to require them:

define(["./features!mspointer?mspointer", ...], function(mspointer, ...) {
});

with dpointer/features:

define(["dojo/has"], function (has) {
   has.add("mspointer", ....);
   // ..
   return has;
}