Added Attributes

Added attributes object which contains public properties for accessing
stats, as well as methods for adding/subtracting attributes.
Entity class started

Started the entity class. Need to implement buffs/debuffs.
Finished a first version of Entity
Slight Correction to Entity

Changed from interface to class.
Added Buffs to Entity

Buffs should be good to go
Merge pull request #5 from rdurel423/master

Updated Attributes Class
Merge pull request #6 from Davis725/master

Version 1 of Entity
ugh
Merge remote-tracking branch 'upstream/master'