Add the missing removeTodo method to the sample.
Add a guide on the router flow when a user clicks on a link-to
Note about exception being raised and how to address.
No need to duplicate stuff here and in the show-only-incomplete-todos.md file.

We can expect people to read the Todos guide from beginning to end, so I don't think we need to duplicate the exact text on multiple pages. Hence, I feel that this change makes it look a bit more polished and elegant (even though it can certainly still be improved further).
Add a cookbook on using slugs instead of ids in the url
Put linear-gradient in line with w3c spec
Remove or fix broken links
Fixed whitespace left and right
added whitespaces
Fix example output for "Creating Instances"
Merge pull request #1441 from felixkiss/patch-1

Fix example output for "Creating Instances"
Removes unnecessary whitespace and adds period.
Merge pull request #1442 from duggiefresh/test-helpers-cleanup

Testing Guide, Test Helpers: Removes unnecessary whitespace and adds period.
Add opening curly brace
Merge pull request #1443 from aaronransley/patch-1

Add opening curly brace
Update adding-a-route-and-template.md

Double extra clear
Merge pull request #1444 from 1337807/patch-1

Update adding-a-route-and-template.md
Fixed syntax error in testem.json example
Merge pull request #1448 from JarrodCTaylor/master

Fixed syntax error in testem.json example
rearrange unit-testing basics and ember-qunit

previous order introduced ember-qunit, then didn't use it in the next
section on basic testing. put Ember.Object unit testing basics first,
then introduce ember-qunit.