Use Collection#where for TodoList#remaining

Using `Collection#where` for both speed and symmetry.
Merge pull request #2613 from gsamokovarov/todo-difference

Use Collection#where for TodoList#remaining
Changed link to test at backbone.org
Merge pull request #2632 from ingermaa/master

Fixed broken link to test page
slightly clarifying collection.model docs
Merge branch 'master' of github.com:documentcloud/backbone
Gawker Media as an example app
Removed unnecessary variable 'matched'
Merge pull request #2637 from kjbekkelund/remove-unnecessary-variable

Removed unnecessary variable 'matched'
Be explicit about boolean "trigger" option.

Closes #2647.
Add missing comma.
QUnit 1.12.0
Merge pull request #2652 from braddunbar/qunit

QUnit 1.12.0
Fixed typo: missing s in "asynchronous"
Revert "Fixed typo: missing s in "asynchronous""

This reverts commit d651f833e81f5c93fa7b128dfa7b08a6eb8c7170.
Fixed typo: missing s in "asynchronous"
Merge pull request #2655 from eastbayjake/master

Fixed typo in index.html
Replace non-standard #substr with #slice.
Fix #2656 - Trailing slash on root.
Never include trailing slash on the root.