Fixes homebrew problem with htop: "Error: This is a head-only formula; install with `brew install --HEAD htop`".
Fixes homebrew problem with htop: "Error: This is a head-only formula; install with `brew install --HEAD htop`".

Encountered with homebrew 0.8.1. Tested with 0.8.1 and 0.8.0.
wendorf/sprout-osx-apps,pivotal-sprout/sprout-osx-apps,wendorf/sprout-osx-apps,1000Bulbs/pivotal_workstation,Yesware/sprout,wendorf/sprout-osx-apps,webcoyote/pivotal_workstation,pivotal-sprout/sprout-osx-apps,webcoyote/pivotal_workstation,1000Bulbs/sprout,1000Bulbs/pivotal_workstation,1000Bulbs/sprout,se3000/pivotal_workstation,Yesware/sprout,webcoyote/pivotal_workstation,Yesware/sprout,pivotal-sprout/sprout-osx-apps