Updates CityHash to v1.1.0 from Google. Since v1.1.0 changes some of the hashing algorithms, I've updated all the tests as well.
Tested on OS X with clang 4.2 and GCC 4.2.1, with -msse4.2 and without.
As discussed in #7, this change is NOT backwards compatible due to changes in hashing, so a new release branch would probably be a good idea.
Upgrade cityhash to 1.1.0
Add hash32() for CityHash32()
Add objectify() support for new 32-bit hash value
Update tests for CityHash v1.1.0 hash results