Implement an offset anchor dynamic CSS class.

`.wdn-offset-anchor` is generated at runtime to use the calculated
navigation bar size.

Closes #667
Merge pull request #716 from kabel/fr-667

Implement an offset anchor dynamic CSS class.
Merge pull request #784 from mfairchild365/4.0-events

tweaks to the 4.0 events widget/example
Bumped dependency version number to 4.0.16
Update webfonts

Includes Extended Latin character set for Mercury Text
Merge pull request #786 from skoolbus39/wdn-fonts

Update webfonts
Update webfonts

Includes Extended Latin character set for Mercury Text
Merge pull request #787 from skoolbus39/wdn-fonts

Update webfonts
Bumped dependency version number to 4.0.17
Merge pull request #790 from mfairchild365/4.0-events

4.0 events - legacy start time
Bumped dependency version number to 4.0.18
Merge pull request #791 from mfairchild365/4.0-events

events-bad: Don't display null locations
Added default background-color to promo band
Merge pull request #793 from skoolbus39/wdn-promo-image

Added default background-color to promo band
Add a change log
Merge pull request #796 from mfairchild365/changelog

Add a change log
Have events widgets always display dates in the provided timezone

By default, momentjs converts from the given timezone to the client's timezone.  Thus events displayed in the events widget were being displayed -1hr in western nebraska (because they use the Mountain timezone, not central).
Update the changelog.
Merge pull request #797 from mfairchild365/events-timezones

Have events widgets always display dates in the provided timezone (central)
Update the changelog.