Flesh out the translator module. Def translate().

books/nand2tetris/projects/7_virtual_machine_1_stack_arithmetic/
vmtranslator/translator.py
	-Define `translate()`, which relies on as-of-yet unimplemented
	methods in the package's other modules. Simply aggregates them
	at a high level of abstraction.
	-Add a docstring to the module header.