added wip versions of linegraph
not working yet
graph is drawing
its working! woohoo!
adding dataset support, wip
fixed dataset bug
legend WIP
Fixed #167: property `className` of groups not being applied to related contents and background elements, and not being updated once applied.
clarified var naming
Renamed DataSet option `convert` to `type`.
fixed self referencing node edge selection bug per #168
Timeline now accepts a DataSet with items having any type of start and end.
Reworked all examples to use vis.DataSet
Added an example demonstrating data serialization/deserialization
Merge remote-tracking branch 'origin/develop' into develop
Refactored the property names of DataSet and DataView to having underscore prefixes
everything but legend and barchart working. two axis! woohoo!
added editing of edges with the data manipulation, as suggested by #169
updated history
seperated legend and graphgroups. Still have to think about naming....