Only task which are visible on the screen are shown.
Added a parameter to specify the task precision.
Bugfix: The limit filter did not apply correctly after loading the Gantt for the first time.
Switched to Angular 1.2.0
Bugfix: Crash if show-non-work-hours = false
Updated documentation to include the newest parameters like task-precision or show-weekends.
Include newest angular-gantt.min.js for release v0.4
Merge branch 'release/v0.4' into develop