Add automated regression tester framework

For all your cpsl testing needs. Refer to README for help. If you are
confused contact me for further details. This is simply meant to make
regression testing a much easier process. Note that you cannot test
input functions like 'read' since that would require a human input to
the mars simulator.
Added more test files

Some of my test files might have features different from what a standard
cpsl compiler should do. If this is the case it is a mistake and the
test files should only be testing standard cpsl functionality.
Add more tests

added simple_for, simple_types, and nested_elseif
Revert "Add more tests"

This reverts commit da5d653611b271a94faa5feaf49cd630eb652a4e.
Move files out of base into the tester directory

I added files to wrong location. This fixes that.
Fix (again)

Attempt number two to put things back the way they should be
Remove my version of expressions.cpsl

This version had invalid cpsl code in it.
Add nexted_for and mix_control files

More files to come utilizing the 'stop' statement and for the repeat while.
Add simple and nested repeat tests

also update mix_control to have repeats
Add sig handling and status in tester.sh

Now you can see what files are being run and when you Ctrl+C the whole
script will abort.
Add more test files and base files
Add simple_for_stop and nested_repeat_stop tests
Add README file
Remove test files using stop

I originally thought 'stop' was a 'break' keyword. Apparently this is
not the case.
Merge pull request #7 from ostlerc/master

Add automated regression tester framework