starting work on ch7's VM->assembly translator. Right now, only parsing works
Translator now works on SimpleAdd. Other arithmetic operations not yet supported
adding (untested) unary math commands. I haven't figured out how to meaningfully test these using unittest ... waiting  until I can do the stack arithmetic test provided by the course
heh. fixing stupid errors in unary_math
and, attempting to add <,>,= operations. I'm unhappy with how much repeated code there is for incrementing/decrementign the stack pointer, among other things ... maybe refactor this later
Translator.py now passes the provided StackTest. All the bugs were in my understanding of assembly language, not the translation, and thus uncatchable by pure unittest