Fix code snippet formatting in CONTRIBUTING.md
More code snippet readability cleanup
First cut at a review policy.
Formatting fixup.
Require pairing annotation; readability tweaks.
Merge pull request #12 from dmose/contribute-formatting

Contribute formatting
Merge pull request #13 from dmose/code-review

Code review policy documentation
Merge pull request #14 from n1k0/backbone-vendor

Added vendor statics related to #11
Merge remote-tracking branch 'upstream/master' into backbone-minimal