Merge pull request #5481 from rwjblue/properly-use-indexOf

String.prototype.indexOf returns -1 for non-matches.
[DOC release] Update Ember.computed with depKeys and example
Merge pull request #5486 from knownasilya/docs-computed-dep-keys

[DOC release] Update Ember.computed with depKeys and example
Pull in LazyValue and ember-metal integration
streamy views
actually use lazy values