Release 0.0.23.

Closes #140

File                             Raw         Min         Zip     Min/Zip
index.js                 15693/15.33  5409/05.28  3406/03.33  1983/01.94
Merge branch `release-0.0.23` into `master`.

File                             Raw         Min         Zip     Min/Zip
index.js                 15693/15.33  5409/05.28  3406/03.33  1983/01.94