Append "click to remove" tooltip on table metric hover
Recreate legend and hovers for stacked graph

Hovers are now actual hovers, using the rickshaw standard hoverdetail

The legend for stacked now shows a heap of data for the series, incl. average,
deviation and bounds.
Cleanup of new stacked graph functionality

Add a onChangeDo to fire a function on slider render, which we pass our
generate_legend() function, which will update the metrics for the series
whenever the zoom is changed. The summary will only use data within the zoomed
date range, making these values dynamic.

Also, small formatting changes w/incorporating the date in the hover detail -
prevents previously found bug of the separate date flag being hidden by hover
in some cases. Revert css changes that temporarily brought this back
reuse bootstrap small column and td align right to fix formatting on stacked legend
Reintroduce persistant zooms for rangeSlider Preview

Code doesn't touch the preview, by using the fact that it's all based on the
graph.window.xM(in|ax) values