py.sh: need sudo on OS X
osx.sh: my tweaks to the OS X setup script
.hgignore: better global .gitignore
npm.sh: quiet...always --quiet when you're running npm
osx.sh: install XCode developer's tools
brew.sh: install ruby-build too or rbenv is useless
gem.sh: install gems
.path: more tolerant if rbenv isn't installed