Todo example app

 - static model refactored to instance; mark all tasks as completed checkbox, design (and markup) changes
Todo example app

 -footer containing incompleted items count and 'remove completed items' buttom
Todo example app

 -task edit mode by dblclick (escape, enter)
Todo example app

 - set-all-tasks check box deactivates edit mode
Merge branch 'master' of https://github.com/Bobris/Bobril
Merge pull request #7 from zbartos/master

Todo app functionality enhanced so it's more like the official one