Added test_invalid
Added InvalidInstructionError
Raise InvalidInstructionError.  Minor bug fixes
Added new test
Set elpy-test-runner
removed src/simple-virtual-machine/simplevirtualmachine/bytecodes.  Renamed src/simple-virtual-machine/simplevirtualmachine/bytecodes/instruction.py to src/simple-virtual-machine/simplevirtualmachine/bytecodes.py
Updated to reflect renaming of Instrction to Bytecode
Changed VM to accept code as packed list
Added name of Bytecode class
Changed tests to verify output, too.
Fixed bugs with *LOAD, *STORE, BR* bytecode