Update datepicker.php

Comment out print_r statement
Update date-module.php

Allows the use of jQuery range method "20:+0" i.e -20 years to today
Update date-module.php

Updated using relu preg_match code
Update date-module.php

Remove second yearRange else if statement
Merge pull request #1 from dollardad/master

Update Preg Match
Merge pull request #46 from dollardad/dev

Date Range Feature