Update CONTRIBUTING.md

describe mocha and running a specific test
Merge branch 'master' of github.com:LearnBoost/mongoose into 3.6.x
docs; hide internal
docs; fix geometry
docs;
docs;
docs; indexTypes
release 3.6.1
now working on 3.6.2
docs; readpref strategy
update doc gen
fixed; document#update returns a Query

closes #1397
fixed; corrupted sub-doc array

closes #1408
release 3.6.2
now working on 3.6.3
phony
website; clean up homepage
examples; todo
example; add document methods example
docs; add more links