Fixed typos.  Output result from test_loop code
Merged self.sp and self.stack into a single class Stack.
Merge branch 'master' of github.com:skk/simple_virtual_machine into add-bytecodes-ret-call
Added test_factorial.
Added project-wide logging config.
Updated CALL bytecode.  Updated output methods for Bytecode class.
Updated test for CALL
improvements to update.  Implemented RET and CALL bytecodes
Updated .gitignore for GitEye
Updated operand count for RET
Switched to configing logging module using logging.basicConfig rather
than logging.config.dictConfig.
Correctec type with ILT bytecode.

Updated output produced by dump_bytecode().
Added several tests for factorial code.  Updated numbers used in a few
tests.
Removed Stack class.  Updated VM class to use sp and stack variables.  Updated the output that is produced by VM.  Fixed bugs with several bytecodes.