First set of commands working

First development release. It implements a small set of the commands needed for the hackathon.

Valid commands

Create team

/criar-equipa [team name]
Creates a new team, if the name doesn't exists already. Returns the newly created team information: The name, ID and a access key, which allows users to enter the team using that code. Reports an error stating that a team cannot be created if something fails. If the team name already exists the team isn't created and an error message appears in the chat.

Join team

/entrar [entry-code]
Joins the team with the defined entry-code, if exists. If the entry-code is valid, the user receives a message and joins the team. If it's invalid, an error message pops up.

Balance check

/saldo
Shows the team-wise current balance. If the user does not have a team, an error message appears stating how to join a team.

Buy

/compra [@destination_user] [qty] [description]
Allows to buy something from another user. It performs a transfer, between the command caller and the destination_user, by giving him qty credits. A short description must be provided to describe the transaction. If destination_user isn't enrolled in a team, an error message will be displayed stating that. If qty is invalid (unparsable, negative, null or above team actual balance), the user will get an error message explaining the problem.

List last transactions

/movimentos <qty>
List transactions. If the user has a team, list the last qty transactions of his team. If the current user doesn't have a team, an error message appears stating how to join a team.