Adapted from @DanGoldbach’s fa618397f6f09c274c72b11dcd91800456d1604a.

The regex used for split was returning [""] for the input "", rather than [].

Since there are no immediate plans to expose generic transverse projections,
it’s slightly faster and more concise to inline this implementation.

Use `inDelta` not `equals` for double comparisons in polygon area test

Fixes #1647. What was previously classified as an Irwin–Hall distribution was in
fact a Bates distribution. The irwinHall implementation is fixed, and a new
bates implementation is added.

Fixes #1157.

Conflicts:
	package.json

In some cases IE9 processes the opening of an XDomainRequest synchronously, so
by the time we were setting the response function to parse the DSV file, it was
too late. So instead we use the internal d3_xhr method to set the response
function before the request is sent. This is a continuation of fix #1260.

When computing the midpoint between two points both at longitude -π, there was a
chance that atan2 would return +π rather than -π. Now, we check whether the
points to interpolate lie (approximately) on a meridian; if they do, we can
approximate by using linear interpolation of longitude rather than atan2. This
fixes #1635 which was caused by new trig implementations in Chrome Canary.

Previously, invalid transform attributes were being set for an
ordinal→quantitative scale transition, because entering ticks were
undefined in the old (ordinal) scale, and exiting ticks were undefined
in the new (quantitative) scale.

Fixes #1620.

Rather than both setting the user-select to none and suppressing the selectstart
event, we now prefer to suppress the selectstart event if supported. This avoids
redundantly setting the user-select style, which can be slow. Fixes #1599.