Improve ContainerView guide

This needed to be updated from the refactor when ContainerView
became a MutableArray, and I added examples of defining initial
views in what I hope is a good order for building understanding.
There is also a new section mentioning the impact of ContainerView
mixing in MutableArray.
Lets see if this .gitignore was why our examples page stayed cached on
GH
last resort to flush examples/index.html from GH cache
Merge pull request #355 from lukemelia/container-view-guide-improvements

Improve ContainerView guide
update email
cleanup whitespace
Add wagaroo.com to list of Ember.js users.
remove contacts, we have this data behind the scenes.
fix broken link
Merge pull request #357 from mdcclv/patch-1

fix broken link