Added Polish translation
Add a Vagrantfile to help lazy people to test Kanboard.
Remove space in translation files
Merge branch 'master' of https://github.com/mathgl67/kanboard
Change PHP requirements
Add contributors and change requirements
Update the FAQ, how to use Vagrant
Update readme
Replace Mardown parser by another one to be able to disallow markup or entities
Fix a PHP notice
Show the task description only if not empty
Display HSTS headers only when HTTPS is used
Fix minor errors
Update readme
Fixed PHP notice when user's default project doesn't exist
Add a page to display completed tasks and add the completion date column for tasks
Add kiosk mode, public board access with read-only and auto-refresh
Update for Polish translations.

I've added missing translations and update a few exiting (in Polish we do not use space before and after ':' and '?').
A few more updates in translations.

There is no context for strings so sometime it is hard to guess what would be the best translation.
Add new contributor