Merge pull request #12 from lukaw3d/master

Current sprint: tasks+stories view, without api
Merge pull request #13 from lukaw3d/master

Add task view, fixes
Merge pull request #14 from lukaw3d/master

Current sprint added action buttons
Merge pull request #15 from lukaw3d/master

Some fixes for tasks
extend story model
refactor authorization
sprint stories
sprint story validations
safe sprint stories
New stories can only be added as not done
Getting and posting tasks (with some validations)
Updated Tasks implementation
Trying out new api
Merge branch 'master' of https://lukaw3d@github.com/edofic/scrumble.git
Minifix
Use sprintStory api
Help buttons: Add and remove story from sprint
Tasks smaller buttons
Use Task api
Minifix