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Install Package Control in Sublime Text 3: https://sublime.wbond.net/installation
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Close Sublime Text, remove its
User
directory, and clone the repository in its place.
rm -rf ~/Library/Application\ Support/Sublime\ Text\ 3/Packages/User
git clone git@github.com:jeffshantz/sublime-text-settings.git !$
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Install the Railscasts theme using Package Control.
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Powerline fonts are available here. Specifically, you'll want Inconsolata-dz for Powerline.