Use resolve() to find which ractive.js to require

[sarendipitee]

This solves two issues.

1. If you have ractive installed globally with npm i -g, ractive-loader will pick up on that and use it and it may be the wrong version/patch of ractive (took me a long time to figure that one out sadly :( ).

2. This removes the dependency of Ractive having to be in your node_modules folder by adding support for resolve.alias and for resolve.moduleDirectories. So now you can do something like:

        alias: {
            ractive$: process.cwd() + '/js/lib/ractive.js'
        },

And ractive-loader will pick up on that and require the correct ractive. This is important so that you have the same version of ractive being used to parse your templates as the version you are running. Since Edge and beta versions aren't on NPM, this makes it work for all cases.

[rstacruz]

oh gosh, sorry for ignoring this, totally forgot about this project... haha. nice catch, but we'll have to update those tests too.

  1) ractive-loader a simple template "before each" hook:
     TypeError: Object #<Object> has no method 'async'

It might have to be stubbed in this manner:

https://github.com/rstacruz/ractive-loader/blob/master/test/test.js#L11-L13