Bug 143: Add a new "BetaThing" class for specialized usage of a thing.

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# On branch bug-143
# Changes to be committed:
#   (use "git reset HEAD^1 <file>..." to unstage)
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#	new file:   BetaThing.cpp
#	new file:   BetaThing.h
#	modified:   Makefile
#	modified:   Thing.h
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	thingMaker
