Rickshaw.Graph.RangeSlider.Preview supports millisecond zooming

Changed the domainScale interpolate function to d3.interpolateNumber
(vs. d3.interpolateRound) so that the RangeSlider Preview Window could
zoom into millisecond levels of precision (before it would only allow a
window of 1 second)
Merge pull request #372 from deldrid1/master

Rickshaw.Graph.RangeSlider.Preview supports millisecond zooming
Fix typo
Merge pull request #383 from mo/fix-typo

Fix typo
Ensure Graph creates a copy of the x/yScale before modifying it

x/yScale is coming from the configuration dictionary which may be
referenced by the Graph creator, or shared with other Graphs. We need to
ensure we copy the scale so that our mutations do not change the object
given to us.
Recentered detail dot. explicitly set box-sizing.
refined margin-top
make jQuery dependent bits compatible with jQuery.noConflict(); fixes #396
Rescope stroke style attribute on y-axis

In mbostock/d3 issue #1016, the scope of the `tick` class on a svg y-axis
element changed to include the entire g object (line and text), not just the
line. The Rickshaw CSS for `.y_ticks .tick` was created in the early commits, and
sets the style to be a 2px width semitransparent stroke.

Due to the change in scoping of the style class, the stroke element applies to
both the line and the text element, creating a shadow on the y-axis text labels.

By changing the scope of the stroke stanza from `.y_ticks .tick` to `.y_ticks
.tick line`, the stroke now applies only to the line, and not to the text
element, this removing the stroke shadow on the text label.
Make jQuery known as the global symbol instead of $

To make it actually compile again.
Define $ variable in correct scope
Merge pull request #400 from dwt/jquery-noconflict-fix

Jquery noconflict fix (bug fixes for #396)
Add start and end scripts to allow use of UMD by Rickshaw
Merge pull request #391 from luke3141/fix_dot

Fine tuning for the detail dot
Allow empty data arrays in series.
Find correct domain even if the first series in stack is empty.

This can easily happen when series of different length are drawn and the RangeSlider is used to restrict the graph to a range where one of the series is empty.
Merge pull request #415 from dwt/support-empty-first-series-in-stack

Support empty first series in stack
Removed trailing comma in example
Merge pull request #420 from reustle/master

Removed trailing comma in example
provide a supported interface for toggling stacking