v0.4.0-rc1

All major 0.4 changes are in, so here at long last is 0.4-rc1. 0.4 is still open for bug fixes on the release-0.4 branch, new development continues to target master for the next target of version 0.5

A prepared tarball (the output of make light-source-dist) is attached below in julia-0.4.0-rc1_e5c6964a49.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-0.4.0-rc1_e5c6964a49-full.tar.gz as it already contains all dependencies pre-downloaded and ready for compilation.