[WIP] Exp Leveling

This is my prototype for a leveling system in Hawkthorne.
Currently this is a system of exp. Exp is auro-rewarded on the killing of enemies. 
Leveling is graphed by the function 5(L^2+L), which can be seen here: http://www.wolframalpha.com/input/?t=crmtb01&f=ob&i=5%20(n%2Bn%5E2)
This means that it will take 10 exp to get to level 1, an additional 20 exp to get to level 2 and so on.
An example of the GUI can be seen below:
![EXP2](https://f.cloud.github.com/assets/1076271/346858/a5a8ea26-9e69-11e2-93ac-47463bef427d.PNG)


The leveling system can be used to encourage players to do certain things. For instance, if heath and damage changes with levels, a player will be encouraged to kill the smaller enemies before moving on to bigger ones.