Introduction of Accessors without Ports

When a user requests for a global generator that can be shared
by all modules in the same Node.js process, a new generator
will be instantiated and a property defined on the "global"
object that allows accessing the generator's next method

The Generator Module (Generator.js) includes this new global
Generator.

The Accessor Module (Accessor.js) has been modified to allow
its .next method to determine whether to do a HTTP request or
access the global object