Remove support for RSpec 1

RSpec 3 is about to be released, and maintaining the code for the old
RSpec 1 seemed unnecessary.

Removing support for RSpec 1 simplifies the code.

Change-Id: Ie48297716da589e54d31ff37b9bfd3f3ceb46a06
Reviewed-on: https://gerrit.causes.com/33870
Tested-by: Shane da Silva <shane@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>