julia v0.5.0-rc4

We have been fixing 0.5-critical bugs since the last release candidate, and are now releasing 0.5.0-rc4. Links to binary installers will be sent to the julia-users and julia-news mailing lists. We have branched for release-0.5 - new development will take place on master which is now 0.6-dev, and bug fixes will be backported to the release-0.5 branch according to the steps described at https://github.com/JuliaLang/julia/issues/17418#issue-165613676.

A prepared tarball (the output of make light-source-dist) is attached below in julia-0.5.0-rc4.tar.gz, use this if a source tarball is desired, as it contains a small amount of preparation that a simple archive of the git repository does not. For source builds in restricted environments (e.g. no network access) use the output of make full-source-dist attached below in julia-0.5.0-rc4-full.tar.gz as it already contains all dependencies pre-downloaded and ready for compilation.