Improved casting of dates
Manipulation methods of DataSet now return a list with the ids of the affected items.
Renamed DataSet option fieldTypes to convert, and renamed util.cast to util.convert
Added documentation on DataSet and DataView
Released version 0.1.0
Version number updated to 0.2.0-SNAPSHOT
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	vis.min.js