Update adding-child-routes.md

It wasn't clear that a new empty function() needs to be added to resource() in order for child routes to work at all. This commit briefly explains that this empty functions is necessary
Initial Run Loop Page
change to standard jquery ajax call

jQuery.ajax expects (url, settings) as parameters.  The ajax call to /error-notification used (url, type, settings), which generates a 'GET' in latest version of Chrome, even if 'PUT' is given as the second parameter.
Update Person occurrences to App.Person

In some parts of the guide there is a undeclared Person variable, where the expected is App.Person. This cause confusion, for these that are new to ember.
Merge pull request #1264 from marcioj/patch-1

Update Person occurrences to App.Person
Add a recipe for Google Analytics tracking.
Publish 1.4.0-beta.4.
Show correct version on beta progress diagram.
Merge pull request #948 from tmcgilchrist/google_analytics_recipe

Add a recipe for Google Analytics tracking.
fix small typo
Merge pull request #1265 from jasonkriss/patch-2

fix small typo
Added more content
Remove use of term "theoretically"

Usage of the term _theoretically_ here, prior to this PR, suggests that the behavior resulting from use of a name other than `App` is not confidently known function correctly.
Merge pull request #1266 from extemporalgenome/patch-1

Remove use of term "theoretically"
Update index.md

fixes typo
Merge pull request #1267 from mmitchellg5/master

Update index.md
Fixed grammar/spelling
Updated location for example
Added additional question to FAQ
Grammmar