working on linegraph
minor changes
Merge branch 'develop' into linegraph

Conflicts:
	dist/vis.js
	dist/vis.min.js
updated linegraph, axis style complete
Merge branch 'develop' into linegraph

Conflicts:
	dist/vis.js
	dist/vis.min.js
	src/graph/Graph.js
first working version! =]
graph: fixed bug with empty nodeset hierarchical layout #145
Added focusOnNode function #139
added hover styles and options
added graph3d
filtering not working at the moment
added hover events
updated docs
graph3d functional, examples and playground working. Docs need to be done.
graph3d functional
graph3d finished for vis
Merge branch 'graph3d' into develop
fixed broken examples
tiny refactor and updated history for graph3d
Removed a left over console.log