Merge pull request #6 from r4bugento/master

Share project with other users.
few translates in pt-br
merge and resolve translate conflict
changes to the burndown graph to points of history
add jquery 2.0
add user to a task
team members can have cards in your name
data from project members are loaded via ajax to be added to a card
miss conditional of a guest in card
validation on the board to prevent the card from being moved without being assigned to a team member
added shared projects in the tabs of my projects
improved burndown graph
new modal for board
routine for creating ajax modal task
login in home
login with ajax in home
sidebar modal task
can remove member of card
deleting project
merge conflit solved