#14 Modified the get_measurements input behavior
#14 Modified the get_measurements input behavior

Changed dates to be generic. More description in the commit comment.
Also added code comments for this method.

coddingtonbear/python-myfitnesspal,rbelzile/python-myfitnesspal,rbelzile/python-myfitnesspal,tomn46037/python-myfitnesspal,tomn46037/python-myfitnesspal