Fixed test due to change in legend class names
Fixed test due to change in semantics of yAxis.labels.verticalAlign
Added special null visualization
Added boilerplate for jasmine 2 track in grunt file
Renamed narwhal to contour in test file
Clean up
Enforce data sort order while normalizing data set

Fixes #71
Fixed positioning of tooltip when is outside of the left edge of the chart

Fixes #85
Changed the way the tooltip position is calculated to work better with non-cartesian charts and horizontal charts.

This can still be improved for non-cartesian charts.

Fixes #85