fix(map): fix map to implementation

When mapping to an object, the module definition was set directly
to the object, instead of a new Module instance being created. This
caused an exception later when require() tried to call get() on the
module definition.
chore(release): increment version number
chore(release): changelog
Version 2.0.2
fix(require): require built-in modules

require() now checks for built-in modules and uses node's require
function to return the correct implentation.
chore(release): changelog and version
Version 2.0.3