Implemented game of life

First implementation of Game of Life.
Using somewhat more efficient structure than the naive solution.
Still not "infinite" in its size, but can be remedied.
Refactoring and bugfix

Had several bugs concerning organisation of data (was unsorted, which
is not good in the long run) and mixing up X and Y coordinates.

Extracted Row and Culture classes from Population.
Added GUI

Added a GUI using the Laterna library. Laterna is a ncurses-like
library that creates a terminal window, if necessary, to display
the UI.
The UI also calculates the time it takes to calculate a new population
from the old and displays those values. Not yet capable of accepting
user input, but that is forthcoming.
Merged in the first iteration of the Game Of Life implementation.

This is Game of Life.

Merge ../life

Conflicts:
	.gitignore