Adding eLife Lens as an example app.
Adding a do-not-post-if section to CONTRIBUTING
Giving CONTRIBUTING a more accurate title.
remove null options guard

no need to check for null options here as the first line of the
function already assumes an options object.
Merge pull request #2702 from hartzler/remove-unreachable-code

remove null options guard
Fixes #2684 -- tweak toJSON docs.
Merge branch 'master' of https://github.com/jashkenas/backbone
use shorter form for comparator
fixed two stand-out typos :)
Restore "elan".
Merge pull request #2706 from akre54/comparator-docs

Update comparator example in the docs
Fixing travis-ci badge after repo move
Merge pull request #2728 from philfreo/patch-1

Fixing travis-ci badge after repo move
(2x) new Collection -> new Backbone.Collection

Apologies in advance if I've misunderstood this.
Merge pull request #2732 from douglascalhoun/patch-1

(2x) new Collection -> new Backbone.Collection
Merge remote-tracking branch 'remotes/documentcloud-original/master'