Infer version 0.9.4.1

This is a source release of Infer packaged with pre-built binaries for clang and facebook-clang-plugins for Linux and MacOS. To use it follow these instructions. It only contains hotfix to infer 0.9.4 fixing #508

The sha256 checksums of the tarballs are:

$ shasum -a 256 -p infer-*-v0.9.4.1.tar.xz
860f20741bd54f1e058e0e0c4550fc4211016ef93f154938eb173df555a560df ?infer-linux64-v0.9.4.1.tar.xz
a738a3492a4e0229df8abd745cd88bca8fb547bc3bcca15ec194d6780b07cbda ?infer-osx-v0.9.4.1.tar.xz