power-assert:

  * provide API for customization (see CUSTOMIZATION API section in README)

power-assert-formatter:

  * new `diff` option to make string diff function pluggable
  * new `outputOffset` option to configure number of spaces inserted at the left
  * new `ambiguousEastAsianCharWidth` option to make ambiguous east asian character width configurable

espowerify:

  * transform file if and only if it is listed in browserify entries