Added readme for the runtime
Renamed runtime and globals module names to make more sense as filenames
Added module to store Angl's global namespace at runtime
Added untested implementation of $ART.createAnglObject, the runtime method
used to control the order of Angl object creation
Committed stubbed-out runtime support for with() loops
Added runtime module, which simply merges properties from all runtime
sub-modules onto a single object.

- allows us to split runtime source across multiple files, but expose
  single runtime object at, er... runtime