Do not quote completions in $reply

With an empty list of completions, zsh would complete a space / advance
the cursor by a space when completing.
Merge pull request #231 from blueyed/fix-zsh-completion-for-none

Do not quote completions in $reply
Use consistent quoting for `versions=("$@")` across bins
Add PyPy-2.4.0 (fixes #241)
v20140924