rebuilt vis dist
added option to setOptions to avoid resetting view.
rephrased docs
restored setOptions, removed reset of view.
Some tweaks in snapping dragged items to nice dates.
added zoomable and moveable
Merge branch 'develop' of https://github.com/almende/vis into develop

Conflicts:
	HISTORY.md
Fixed #141: a bug in replacing the DataSet of groups via `Timeline.setGroups(groups)`
Merge remote-tracking branch 'origin/develop' into develop
renamed variable for clarity
Merge branch 'develop' of https://github.com/almende/vis into develop
Merge branch 'develop' into linegraph

Conflicts:
	dist/vis.js
	dist/vis.min.js