add stack overflow to readme
website; add stack overflow
use correct engine version
updated; driver to 1.2.12
Remove redundant `that`
Merge pull request #1342 from afshinm/patch-1

Remove redundant `that` from updating docs
docs; be specific about _id schema option

follow up to #1103
fixed; add EventEmitter props to reserved paths

throw friendly errors when `emit` or `_events` are used in schema.

#1338
fixed; properly pass Binary subtype
populate; add unscientific benchmark

1 doc
=========================
3.5.5:   8211  completed
3.6-pre: 12358 completed

  ~1.5 x

10 docs
=========================
3.5.5:   1672
3.6-pre: 4708

  ~2.8 x

20 docs
=========================
3.5.5:   900
3.6-pre: 2752

  ~3.0 x

50 docs
=========================
3.5.5:   378
3.6-pre: 1252

  ~3.3 x

100 docs
=========================
3.5.5:   180
3.6-pre: 692

  ~3.8 x
fixed; display empty docs as {} in log output

schemas with _id and id set to false were output as undefined
instead of {}

follow up to #953
docs; populate options
release 3.5.6
Merge branch 'master' of github.com:LearnBoost/mongoose
Merge branch 'master' into gh-pages
website; regen for 3.5.6