Refactoring and code cleanup

Converting deckard to use AMD wrapper

Status: **Ready to merge**

Reviewers: @tedtate @johnboxall 
JIRA: https://mobify.atlassian.net/browse/CSOPS-766

## Changes
- converted to use AMD wrapper
- removed orientation-changing class. It's not guaranteed to be removed when the event is completed, therefore provides a bit of a buggy implementation
- added examples section
- refactored detect and orientation functions to separate concerns; added addClasses function to perform class adding
- simplified class toggling on orientation change to reduce reflows

## How to test-drive this PR
- checkout this branch
- `grunt test`
- integrate into a plugin, like lockup, and ensure it works
- `grunt serve` and use the examples page at http://localhost:3000/examples/index.html to verify deckard is correctly adding classes/properties. Use Chrome dev tools to toggle devices and refresh to verify updates are occurring correctly.

Wait sorry - I totally thought we were talking about using `function{}` as opposed to an anonymous function `function(){}`, which I think makes sense. I've never had an incident where `function addClasses(...)` makes things easier to debug over `var addClasses = function(...)`... @johnboxall could you show the difference, maybe with a couple screenshots?