load: use Require interface from dojo-loader for AMDRequire

[msssk]

The load module was providing an incomplete definition of the Require (AMDRequire) interface, and duplicating code from dojo-loader.

This commit updates load.ts to instead use the Require interface defined in dojo-loader/loader.

[msssk]

Hmmm... I'm not sure this is quite complete. The generated dojo-core-2.0.0-pre.d.ts (from grunt dist) doesn't know about the dojo-loader package - how do we fix that?

[kitsonk]

I will try to look a bit later, but usually it is because you have exported something that dts-generator needs. See SitePen/dts-generator#21.

[kitsonk]

Hmmm actually it looks like maybe dst-generator doesn't handle export as... Maybe open an issue on dts-generator?

[kitsonk]

I think with TypeScript 1.6, we just need to update our tsconfig.json to reference the loaders typings now. If possible, it would be create to get this PR updated, otherwise I can just land it by doing the changes off the current master.

[bitpshr]

I reverified this; the resulting typings look correct @kitsonk and @msssk.