Merge pull request #1 from almende/develop

Sync with upstream
Merge pull request #2 from almende/develop

Merge in upstream changes
family friendly
Merge pull request #93 from coldclimate/fuck

family friendly
Merge branch 'develop'
Merge pull request #3 from almende/develop

Pull in upstream
added update hierarchical layout to update nodes event per #101
Merge branch 'develop' of https://github.com/almende/vis into develop

Conflicts:
	dist/vis.js
rebuilt dist
added arrowScaleFactor per #99
updated history
Fixed #102: offset in newly created items when using groups.
Performance boost. updated itemSet.repaint(). Now only ranged items have to be bruteforced ONCE.
Merge branch 'develop' of https://github.com/almende/vis into develop
Updated some examples
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	examples/timeline/03_much_data.html
moved brute force calc in update. restored examples
updated history, added function documentation
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	examples/timeline/03_much_data.html
Fixed broken example 03