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
Bumped version number to 1.0.3-SNAPSHOT
Fixed `Timeline.clear()` not resetting a configured `options.start` and `options.end`
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
Created simple skeleton with panels: left, right, top, bottom, center.
Improved panel skeleton
graph3d functional, examples and playground working. Docs need to be done.
Improved panel skeleton further, empty panels are now invisible (no border)
Fixed background size (did not reckon with borders of root panel)