Added Google's Gson project to output JSON files.

https://code.google.com/p/google-gson/
Improved family name picking and cleaned up code.

*Changed many attributes from public -> private.
*Instead of deleting a name from the last name list (which is slow in the worst case),
I'm adding unique integers to a TreeSet, which is then used to get unique last names.
*Rearranged the genetics config file to be more logical.
Added gender ratio specifications. Eugenics results, anyone?

Allows for the specification of MALE_BIRTH_CHANCE, represented
by a float between 0 and 1.