Makefile: Windows dep urls
with_env(key,val): temporarily set and restore an evironment value.

Use this to fix #4494 — older gits don't support merge --no-edit.
Pkg.update: call Base.with_env (not an exported function yet)
Fix Matlab/Octave mandelbrot microbenchmark
Update Pkg1 to Pkg.generate in docs solves #4500
Merge pull request #4504 from bartolsthoorn/patch-1

Update Pkg1 to Pkg.generate in docs solves #4500
Merge pull request #4502 from magistere/master

Fix Matlab/Octave mandelbrot microbenchmark
update release notes for min/max changes
Merge branch 'master' of github.com:JuliaLang/julia into jb/minmax