v0.5.0 - preliminary beta release candidate 0

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A prepared tarball (the output of make light-source-dist) is attached below in julia-0.5.0-rc0.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-rc0-full.tar.gz as it already contains all dependencies pre-downloaded and ready for compilation.