Merge branch 'release/v.0.6.1' into develop
Adds Column Date click events.

Adds support for the following events on column dates:

- on-column-date-clicked
- on-column-date-dbl-clicked
- on-column-date-context-clicked

Also updates demo & readme to reflect new events.
Add timespans feature.
Add date and column to task-click event object.
Update README.md

Changed 'center-date="scrollToToday = fn"' to 'center-date="scrollToDate = fn", '$scope.scrollToToday(new Date());' to $scope.scrollToDate(new Date());' in the "center-date" attribute section.  The angular-gantt.js code has the function defined 'scrollToDate'.
Merge branch 'master' of https://github.com/bbyrdsong/angular-gantt into feature/pull-request-96
Added "How to contribute" chapter in README
Issue #105 Add info on on-gantt-ready to the README file and show this better in the sample app
Add CSS to bower.json main property
Update devDependencies and add repository
Add sourcemaps
Merge pull request #109 from Toilal/npm-update

bower and npm updates
Add timeout call to update bindings while moving
Add range collapse support on from-date and to-date changes. Fix #59
Fix invalid left truncation
Allow moving outside of visible view
Fix moving task to another row
Allow going outside visible area while moving tasks from start/end
Fix invalid tasks size when fromDate or toDate changes
Display visual indicators when task is truncated