v5.0.4 (2017-06-13)

Hey y'all. This is another minor patch release with a variety of little fixes we’ve been accumulating~

• f0a37ace9 Fix npm doctor when hitting registries without ping. (@zkat)
• 64f0105e8 Fix invalid format error when setting cache-related headers. ([@Kat Marchán](https://github.com/Kat Marchán))
• d2969c80e Fix spurious EINTEGRITY issue. (@zkat)
• 800cb2b4e #17076 Use legacy from field to improve upgrade experience from legacy shrinkwraps and installs. (@zkat)
• 4100d47ea #17007 Restore loose semver parsing to match older npm behavior when running into invalid semver ranges in dependencies. (@zkat)
• 35316cce2 #17005 Emulate npm@4’s behavior of simply marking the peerDep as invalid, instead of crashing. (@zkat)
• e7e8ee5c5 #16937 Workaround for separate bug where requested was somehow null. (@forivall)
• 2d9629bb2 Better logging output for git errors. (@zkat)
• 2235aea73 More scp-url fixes: parsing only worked correctly when a committish was present. (@zkat)
• 80c33cf5e Standardize package permissions on tarball extraction, instead of using perms from the tarball. This matches previous npm behavior and fixes a number of incompatibilities in the wild. (@zkat)
• 2b1e40efb Limit shallow cloning to hosts which are known to support it. (@zkat)