Adding a team

Ok, I have an idea on what to use as a first iteration on the gameplay loop. The game will use Kanban, as methodology, thus all stories will have the same size and the team will have a fixed capacity of 1 story per person in progress. 

The goal of the player will be to select the right amount of stories in order to deliver as many as possible in a fixed number of turns.

As first step towards it, I implemented a very dumb ai that moves stories: selected -> in progress -> done. Now it moves one story per second, but I will make it smarter as time goes by.