Resolver does not honor the loader noconflict aliases

[rajasegar]

If we use the loader.noConflict method from the loader.js, with the following aliases,

loader.noConflict({
require: 'myRequire'
})

the app fails with an error

Uncaught TypeError: Cannot read property 'entries' of undefined
    at new ModuleRegistry (vendor.js:formatted:68415)

because there is no global require object, we only have myRequire now

Related to ember-cli/loader.js#139

[rwjblue]

Definitely possible to fix, would love a PR.