Some fixes for Range and its tests

[Brian T. Rice]

Patch applied. Thanks.

Ken Causey wrote:

> This patch makes two changes.
> 
> 1.  It adds some very basic range and number math to satisfy one of the
> tests.
> 
> 2.  It fixes tests for missing elements with indexOf: that were checking
> for 0 rather than Nil.
> 
> Ken

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