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The shortest-path interpolation for HSL was causing all the bars to be the same
color. Switching to string-interpolation preserves the original behavior.

Conflicts:
	examples/transform/test-rotate.html
	src/core/interpolate.js

If the transform transition isn't the same type, then we can use the shortest-
path for rotate transitions. But, if the transforms are the same type, then we
should use the simpler string interpolation without the shortest-path.

We no longer pick the shortest path for same type transitions.

Avoid unnecessary object creation.

For consistency with CSS3 [1], a null "from" or "to" transform list is
replaced by an identity function list whose types match those of the
non-null transform list.

[1]: http://www.w3.org/TR/css3-transforms/#animation

Also, fix the transform rotate test.

Fixes #620. Also adds county names.

The process.env.TZ trick no longer seems to work. The fix automatically
adds an offset to the minutes being set, relative to the current
timezone. It assumes that the dates being tested in the scope are not in
DST, since the offset is relative to the timezone offset at the epoch.

Thanks, @mbostock!

Thanks, @mbostock!

Also avoids floating point errors without clamping, hopefully.

Uses the identity sin^2(x) + cos^2(x) = 1.

Behaves the same as selection.filter.