Complete fix #4478
Fix pisum and mandelbrot microbenchmarks
Merge pull request #4490 from magistere/ys/micro

Fix pisum and mandelbrot microbenchmarks
Merge pull request #4489 from magistere/master

Complete fix #4478
fix #4482
Added eltype(::String) fixes #4491
add test for #4486
Merge pull request #4493 from ivarne/eltype_string

Added eltype(::String) fixes #4491
add another eltype definition for String
fix #4487
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)