First commit with Xcode of DiceRoller.
This second commit adds a Dice abstraction, allowing a programmer to deal with a pair of dies as a unit.
It also adds a DiceRoller class which adds the following capabilities:
   -Read a config file specifying the attributes of two dies and a number of rolls to perform.
   -Perform the calculations read from the config file.
   -Print a statistical summary of the calculations performed.
This commit introduces the new Classes DieRoller and LoadedDie.  Die is now a base class which LoadedDie inherits from.  DieRoller can now read a config file containing dice with a type "Normal" or "Loaded". DieRoller can now read a file containing n dice and print a summary for each.
This revision has multiple changes:
   1) Code separated into src, header, and test directories
   2) Makefile for building outside of xcode.
   3) Makefile builds a library of dice classes
Merge branch 'master' of https://github.com/nathanjjohnson/libdice