[Test Helpers] Find's context defaults to rootElement

The find method's context argument defaults to the application's
root element if it isn't specified.  This updates the language
to reflect that behavior.
Merge pull request #1438 from jonathannewman/update_wording_on_find

[Test Helpers] find's context defaults to root element
Typo fixes for testing guide.
Merge pull request #1439 from ugisozols/testing-components

Typo fixes for testing guide.
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
Merge remote-tracking branch 'base/master'

Conflicts:
	source/guides/getting-started/adding-a-route-and-template.md