Experimental changes to the Birthing system

Changed class names from BirthsXXXX to XXXXBirths.
Births is now an abstract class.
Created Enum BirthNumber to replace the booleans firstBirth, secondBirth
and thirdBirth.
Wrote a test program, TestBirthNumberEnum to test the enum.
Removed some setters that are (maybe) unnecessary.

Variables for the number of nurses required for the different births
(and for the different birth numbers) have been removed. Instead, each
subclass of Births will implement a birth() method, and the tests for
the number of nurses required will be done there.

In the Resources class, changed Larves (French) to Larvae (English)
Merge remote-tracking branch 'origin/experimental'

Conflicts:
	src/antColony/Resources.java
Merged Experimental branch into Master

Premier essaie de fusionner deux branches - j'espère que ça se passe
bien
Made changes to AntColonyBoard

Added a constructor for AntColonyBoard
Wrote a test class: TestAntColonyBoard
Added AntColonyBoard object to Births class
Tested Births

Tested births in the TestAntColonyBoard class. It seems to work.

Note: the implementation of births is still not complete (TO DO:
WorkerBirths and SoldierBirths)