first unit class created
first model prototype
First load of json unit

can load units without stats (need new json)
Added Value and Tag model

Value and Tag will be used for the StrengthWeakness calculation of
physicalHit.
added skills(and spells) feature to unit

need to load the objected spell by name.
Now loadUnit return an array of unit
Merge pull request #104 from spyl94/add-unit-server

Add unit server