fixed; utils.clone retains RegExp opts

closes #1355
website; add changelog to homepage
website; add follow buttons
fix db test
deepEquals handle RegExp now
updated; driver to 1.2.13
release 3.5.7
fixed; CastError race condition
Allow authdb option in connections.
Remove debug for authdb.
Properly pass authdb option.
refactor auth options
docs; auth options
test; more thorough test for #975
docs; add note about stream compatibility with node 0.8
release 3.5.8
Merge commit 'ff60caf80951311e0cd9bc1746421f66a7b1d898' into origin/master
Merge remote-tracking branch 'refs/remotes/learnboost/3.5x' into origin/master