renamed avatar skeleton from "bones" to "joints" to be more consistent with standard language. Also improved skeleton some
adjusted proportions of avatar skeleton to make it closer to average human
(1) added avatar tilting while walking; (2) added avatar renderer; (3) tweaked body proportions; (4)
adding avatar renderer
Fixes per merge (Ventrella)
Merge pull request #181 from Ventrella/master

renamed avatar "bones" to "joints", and improved skeleton