Fixed screenflow.pause test

This test would work if the game started in the title screen, but then
the earlier doc tests would fail, so I removed the first exclamation
point.
Merge branch 'amstocker-master'
updated copyright statement
Test 2 completed - generate grid
Tests 1-4 completed
Test 7 completed
forgot to add Matrix class
Changed to switch-case
switched to exit because break only leaves inner loop
bad shape implementation
I rotation completed, and O by default
cleaned up code a bit
refactored rotate function
Z rotation working
S rotation working
refactored printActiveTetramino
all rotations completed
refactored to remove showActiveTetramino
moved rotation functions into separate file
commands can be sent without spaces