Control should lookup default view on subContainer
{{control}} now correctly removes observers
Removes vestigial controls/tabs file.
Additional documentation for {{each}} helper.

  * Adds a mention to {{else}} for each {{each}} which doesn't
    seem to be widely known
  * Adds the itemController option with example
  * Removes call to App.initialize() in example
Add rake task for building pull requests
Merge pull request #1966 from trek/additional-docs-for-each-helper

Additional documentation for {{each}} helper.
Merge pull request #1959 from ghempton/control-default-view

Control should lookup default view on subContainer
Merge pull request #1963 from GroupTalent/control-observer

{{control}} now correctly removes observers
Merge pull request #1965 from trek/remove-tabs-control

Removes vestigial controls/tabs file
Merge pull request #1967 from darthdeus/feature/pull-reqeust-rake-task

Rake task for building pull requests
Targets are looked up lazily; Fixes #1150
Update Gemfile.lock
Create activate and deactivate hooks for router
Add start of {{render}} documentation
Make detecting mandatory setters possible

This allows debugger tools to ignore them
Provide a view's template name for debugging
Add _debugContainerKey
Allow 0 as the value of a tag
Don't build release until after tagging - Fixes #1813
ArrayController test: #lookupItemController is not called when `idx` is out of range