Fix executable bit of zpl.js

[bepvte]

On linux, zpl.js isnt executable.

$ npm exec zpl
sh: 1: zpl: Permission denied

[bepvte]

npm exec zpl
/usr/bin/env: ‘node\r’: No such file or directory

It looks like you published it with crlf endings. You could use the .gitattributes file I put, or just change your git settings.