Flesh out docs for CollectionView#getItemView

Resolves #509
Set view options before Behaviors are initialized
bump and build v1.8.3
Update marionette.behaviors.md
Merge pull request #1224 from ftdebugger/patch-1

Update marionette.behaviors.md
Fix Typo in Changelog

1.6.3 example showed a function returning an `events` hash when it should have been returning a `ui` hash.
Merge pull request #1235 from joezimjs/patch-3

Fix Typo in Changelog
Fix behaviors doc ToC
Merge pull request #1277 from thejameskyle/fix-behaviors-toc

Fix behaviors doc ToC
Bump and build v1.8.4
Should have been values not keys here
Merge pull request #1278 from therealjessesanford/master

Should have been values not keys here
Update CONTRIBUTING.md

Missing 'a'.
Merge pull request #1281 from bzalasky/patch-1

Update CONTRIBUTING.md
Update CONTRIBUTING.md

Couple more typos.
Merge pull request #1282 from bzalasky/patch-2

Update CONTRIBUTING.md
Did a quick editing pass

A couple of comma's that should be there, and chopping a wordy sentence down to an adverb. I promise I'll make some non doc/grammar contributions soon. I've been using Marionette for 2+ years now, and would like give back to the project that's given me so much.
Merge pull request #1293 from bzalasky/patch-3

Did a quick editing pass
Add unwrap to babysitter and wreqr to remove UMDs
Bump and build v1.8.5