Updated commands (xp,ad,ap,mana)

If you set xp to 281 (1 more than required to level up) it does not level up,it stays at max exp.
Added .size command to change champion size
Update Stats.h
Added ".size" to cmds
Merge pull request #13 from MRPixelMC/master

Updated commands (xp,ad,ap,mana and size)