Allow the alpha channel to be omitted when instantiating a color from an array: one.color(['RGB', 0, 0, 0])
Release 2.3.3.
Revert "package.json, postpublish hook: Use the locally installed jam binary."

This reverts commit 2ffac1676871f44f51b0013ec5541eb3187f1c46.
package.json: Don't depend on jam (must be globally installed).