Added jquery tree-menu to master_on_bootstrap

So this block here is what I'm missing it looks like as I had tried to add this library in.  We shouldn't add our custom bits of code to the end of the vendored libraries like this it should only be the library, and then this code should be called from like https://github.com/spree/spree/blob/master/backend/app/assets/javascripts/spree/backend.js

I'm going to pull this in and then will update the location of this.