Adjust datepicker to display current field date

When datepicker is toggled on, set the date in the input field as 'currently selected' if it's within min/max range. #1476
Merge pull request #2030 from EricDunsworth/v3.0-broken-link-fixes

Fixed broken links to license files in working examples index pages.
Ported v3.1 unlinked headings in mega menus support.
Added JSHint scripturl tolerance to pe-ap.js.
Merge pull request #2035 from pjackson28/v3.0

Ported v3.1 unlinked headings in mega menus support
Ported v3.1 fixes for #2007 to v3.0.
Merge pull request #2046 from pjackson28/v3.0

Ported v3.1 fixes for #2007 to v3.0
Ported new v3.1 fixes for #2007 to v3.0.
Merge pull request #2048 from pjackson28/v3.0

Ported new v3.1 fixes for #2007 to v3.0
Fixed JSHint issues.
Merge pull request #2049 from pjackson28/v3.0

Fixed JSHint issues
Fixed various issues in working examples index pages.
Merge pull request #2051 from EricDunsworth/v3.0-demos-indexes

Fixed various issues in working examples index pages.
Corrected French About WET links.
Merge pull request #2065 from pjackson28/v3.0

Corrected French About WET links.
Removed unnecessary address element from the new working examples footer.
Merge pull request #2068 from pjackson28/v3.0

Removed unnecessary address element from the new working examples footer
pe-ap: fixed samed page link behaviour in Firefox

Using the back button after clicking a same page link now returns
scroll position to the original position of the same page link.
Merge pull request #2073 from patheard/firefox-named-anchor

pe-ap: fixed samed page link behaviour in Firefox
Corrected Contributor guideline links.