include Pkg1 in sysimg and update documentation [close #4091]
Merge branch 'master' of github.com:JuliaLang/julia
Fix #3941

This is the immediate julia-level fix. It's actually amazing that this worked so long. Unfortunately
this doesn't fix the underlying issue in libuv having to do with reading from non-asynchronous pipe. I need to see if I can up with a new julia-level test case.
Merge branch 'master' of github.com:JuliaLang/julia
Add missing _'s in Pkg