Improve requirejs.config
Improve requirejs.config

As mentioned in https://github.com/linev/jsroot/issues/10 discussion,
check if modules with given name already defined.
asseldonk/jsroot,root-project/jsroot,linev/jsroot,linev/jsroot,bellenot/jsroot,asseldonk/jsroot,bellenot/jsroot,bellenot/jsroot,root-project/jsroot