Upgrade angular js to 1.2.0rc1
`controller as syntax` for todos list.
Refactor todos controller.
Display validation errors.
Add basic animations.
Refactor other controllers.
Fix casperjs specs.
Fix e2e specs.
Bump express version.
Use available node js version.
Add karma dependency.
Fix and refactor casperjs scenarios.
Merge pull request #43 from lucassus/feature-upgrade-angularjs

Upgrade angularjs