Add define() to UMD to make proper AMD package

https://github.com/thedersen/backbone.validation/blob/master/dist/backbone-validation-amd.js

With no `define()` I encounter the error:

`Uncaught Error: Module name "backbone.<moduleName>" has not been loaded yet for context: _. Use require([])`
Suffix to return amended Backbone object
new build according tonys AMD patch