Add event hooks to clearing

Trigger events open.fndtn.clearing, opened.fndtn.clearing,
change.fndtn.clearing, close.fndtn.clearing, closed.fndtn.clearing at
appropriate spots.
Add documentation for clearing events

Docs and examples for open.fndtn.clearing, opened.fndtn.clearing,
close.fndtn.clearing, closed.fndtn.clearing and change.fndtn.clearing
Change event names in doc to match event names in code.
Add new event resized.fndtn.clearing

This event occurs after an image has been resized, so you can access
the new image size.
Fixed Section to evaluate size constraints against the actual
"small" media query rather than specifying the size via a
setting in javascript.  This prevents all kinds of strange
behavior caused by scroll bars being included in the media
query width but not accounted for in our code.  See the
following for more info:

http://www.456bereastreet.com/archive/201301/media_query_width_and_vertical_scrollbars/
Magellan will now remove the active class when above every arrival-point
Convert tabs in application.html.erb template to spaces
Remove noradius example from tooltips docs page
Support ajax form handling with in Abide.
Bump Clearing to 4.3.3, fix code rendering in clearing docs.
fix data-slug attributes in sections docs
update orbit slide animation to move both current and next/prev slides at the same time
Update favicon paths to be relative to root url
Separate form error classes from other classes

Some projects want the ability to use abide and display errors with the default
error styling, but not include foundation's defaults for input and select styling

This commit adds a variable $include-html-form-error-classes that will include
the error classes separately, thus letting us use abide independently.
Update CHANGELOG.md
Missing variable from docs

Causes dropdown label to be inconsistent when excluded.
Remove check for loaded images in Interchange as this should be the user's decision.
Conform syntax to non-underscore methods in Interchange.
Update CHANGELOG.md
Fix closing tag in section docs