Active tab will default to the tab with the first error present. Tab icons will also be changed to an option called icon_error to let users know there is an error in that tab.
Updates datepicker.js to match actual file name.

Not sure if the file name or this file needed the name change but they should match.
Merge pull request #567 from tdmedia/master

Updates eyecon-bootstrap-datepicker.js to match existing file name.
Merge pull request #566 from isometriks/active-tab-errors

Show errors in tabs and set first tab with error to be active.