Mac OS X download of ace-jump-mode breaks with utf-8-unix encoding

[codemac]

i was very excited to get my friend who is a new-ish emacs user onto the ace-jump-mode train, and the install step from M-x list-packages RET C-s ace-jump-mode RET i x fails on one of your contributor's names in ace-mode-jump.el:

These default coding systems were tried to encode text
in the buffer ` *temp*':
  (utf-8-unix (1489 . 4194278))
However, each of them encountered characters it couldn't encode:
  utf-8-unix cannot encode these: \346

Click on a character (or switch to this window by `C-x o'
and select the characters by RET) to jump to the place it appears,
where `C-u C-x =' will give information about it.

Select one of the safe coding systems listed below,
or cancel the writing with C-g and edit the buffer
   to remove or modify the problematic characters,
or specify any other coding system (and risk losing
   the problematic characters).

  raw-text no-conversion

And then it shows

;; So I want to thank to :
;; Bartlomiej P. for his PreciseJump
;; Kim Silkeb\346kken for his EasyMotion

As the name in the buffer. @nordsieck is the one who was having this problem. He's on emacs version:

GNU Emacs 24.4.1 (x86_64-apple-darwin14.0.0, NS apple-appkit-1343.16) of 2015-02-14 on theodores-MacBook-Pro.local