I should point out the main Julia package listing is at http://pkg.julialang.org/, this is the "executive summary" page. At the bottom of this "Pulse" page are test results - we run the tests for every package every night on both Julia stable (0.3) and unstable (0.4) to make sure everything is still working nicely together. Although, breakages on 0.4 just mean cool stuff is happening on master.