Added 32-bit Linux binary.
Merge pull request #4 from matadon/master

32-bit support for Linux.

sha1 (5f873d08d292eeedc013b21331ffa3b4c06095f6) of binary matches one from
https://code.google.com/p/phantomjs/downloads/detail?name=phantomjs-1.8.1-linux-i686.tar.bz2