start of multi label callbacks
added scale and labels to bar gauge, horizontal working, vertical needs work
scale now changes on a redraw if needed
bargauge now respects the dc.disableTransitions property
tooltip added for the main bar
fixed width and height properties that should be accessed from the chart, not the dom
markers now placed above the grid lines in dom
changed default formatter for markers
added default marker dimensions for use when resize goes wrong
multi labels with positioning work
added tree-map
big label example working
Merge branch 'bargauge-scale'
merge with multilabel treemap