Add `bundle install` step

Not obvious to non-rubyists like me.
updated jsfiddle and jsbin examples to work with v1.0.0-PRE.4
updated jsfiddles to use ember-1.0.0-pre.4.js
Allow redirecting from mid-route
Updated documentation for the return value of Ember.Array.findProperty() and Ember.Array.find(). Fixes issue #1831
Merge pull request #1855 from craigteegarden/find-findProperty-docs-1831

Updated documentation for the return value of Ember.Array.findProperty()...
Merge pull request #1841 from rlivsey/redirect-from-resource

Allow redirecting from mid-route
lastRenderedTemplate only set if the outlet was main
Merge pull request #1838 from joeytrapp/default-render-into

Calling this.render() in renderTemplate() more than once breaks default into value.
Add documentation stub for Ember.Router

Adding /** @scope Ember.Router.prototype */ makes YUIdoc print out the
entire router definition, without any error message. It doesn't actually
blow up, it just prints source. It's strange.

The method listing don't seem right yet -- it contains methods like
Ember.Route#controllerFor. But it's a start.
Replace outdated injections documentation with initializer documentation

The default injections went away, so this section is now fairly
minimalistic.
Fix wording, remove redundancy
Merge pull request #1857 from CrowdStrike/initializer-doc

Replace outdated injections documentation with initializer documentation
Allow libraries loaded before ember to tie into ember load hooks
Merge pull request #1861 from machty/pre-ember-load-hooks

Allow libraries loaded before ember to tie into ember load hooks
Fix ClassNameBinding to work in a  removed view

ClassNameBinding did not work when a binding property was updated in a removed view, so the className did not apply as expected when the view was rerendered
Use getURL() in HistoryLocation

When trying to subclass HistoryLocation, it's hard to override certain
methods, because they don't use public API of this class for getting
URL. This patch changes all calls to location.pathname into getURL()
calls.
Allow to override router's handleURL
Merge pull request #1845 from drogus/be-consistent-in-history-location

Small improvement in HistoryLocation: Use getURL()
Remove typos in code example