URL objects in library and OpenUI5 entry

- library URLs can be objects, to allow required script attrs
- additional OpenUI5 library, with 2 script attrs

Hope you can consider this - we'd love to be able to make [OpenUI5](http://sap.github.io/openui5/) available as a library in jsbin. For any normal deployment there are at least a couple of data- attributes in the script tag, hence the mod to allow URLs to be specified as objects. 

Thanks!