Updated backbone.marionette

Added update from their github repo at
https://github.com/marionettejs/backbone.marionette
Merge pull request #3408 from JGallardo/master

Updated backbone.marionette
[author] Update oCanvas to 2.7.2
Merge pull request #3411 from koggdal/ocanvas-272

[author] Update oCanvas to 2.7.2
More work on CONTRIBUTING.md

Flesh out 5.0
Tweak CONTRIBUTING.md
CONTRIBUTING.md changes

Flesh out 5.1
Remove backticks in CONTRIBUTING.md

Oops
More CONTRIBUTING.md stuff

Last change for today.

I hate robbing banks.