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.

- Various whitespace modifications
- underscore var names -> camel case
- extract point sort comparator to a global function so it’s not constantly initialised each time you hull
- postincrement -> preincrement in for loops
- use single `var i` at top of function rather than constantly redeclaring for each for loop

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.

Conflicts:
	d3.min.js