Fixed interface formatting.

Version 1.1.0

Fixed the interface format to match that of the assignment.

Rewrote the input parser around std::getline and std::stringstream
in order to facilitate the new input format. I now accept input
from the user line by line, move that input into a stringstream,
and then parsed the stringstream one word at a time using my old
parsing code.

* main.cpp - Rewrote input parsing system.

* deliverables/log.md - Updated progress log.

* constants.h - Updated version to 1.1.0.