Update AUTHORS.md
FIX: Prevent git from ignoring uploads and public/attachments folders
Merge pull request #17 from smilledge/bugfix/keep-upload-folders

[FIX] Prevent git from ignoring uploads and public/attachments folders
REV: Add due date to a card
Swap jQuery timepicker for jQuery-ui timepicker
Prevent due date from being set in the past. Allow user to remove due date. Other bug fixes.