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Fix #2737. The previous fix for #2722 meant that createElement was used to
create HTML elements in HTML documents, but it also meant it was used to create
SVG elements in SVG documents, which failed: createElement only inherits the
namespace in HTML documents, not in other document types.

https://www.w3.org/TR/dom/#dom-document-createelement

Component is not maintained anymore, per componentjs/component#639.

Fixes #2728.

If the implicit namespace of the created element matches that of the document
element, the document’s createElement should be used instead of createElementNS.
This way, in documents for which createElement is case-insensitive—most notably
HTML documents—selection.append is likewise case-insensitive.

Fix browserify key in package.json

Drag behavior is broken for <svg:use> elements on certain
browsers. This includes d3.layout.force(...).drag()

On browsers like Internet Explorer 11, the <svg:use>
EventTarget is represented by a SVGElementInstance that looks
like this:

    [object SVGElementInstance]
       {
          [functions]: ,
          __proto__: { },
          childNodes: { },
          constructor: { },
          correspondingElement: { },
          correspondingUseElement: { },
          firstChild: null,
          lastChild: null,
          nextSibling: null,
          parentNode: { },
          previousSibling: { }
       }

No other properties such as .style are present. We must use the
correspondingElement property to access the actual SVG element
instantiated by the <svg:use> in order to have a successful drag.

- (x - x0) / k sometimes provides a value with trailing 0's due to division. This means groups that have an integer value appear to be a decimal number

Related #2654.

This fixes a priority inversion where a transition B that is scheduled on
transition A’s start initializes its tweens before transition A has its first
tick. By scheduling transition A’s first tick before dispatching A’s start
event, it’s first tick is guaranteed to run before any new transition’s tweens
are initialized.

Related #1576 d3/d3-transition#16.

This reverts #312, since we later implemented a more robust check in #1005 using
a zero-delay timeout to expire click suppression.

Firefox doesn’t correctly hoist functions defined inside if blocks, so move the
functions out of the if block.