keit

1) launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

2) rm -rf /usr/local/var/postgres

3) initdb /usr/local/var/postgres -E utf8

4) createdb

5) launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

keit

This document is outdated. 
You should read David Bryant Copeland's excellent online book: http://angular-rails.com/crud_recipe.html
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I think it's better to install javascript/css libraries using Bower rather than gem which is Ruby packager.

1. Install Rails 4 and create a new project.

2. Install bower(Note you need to install node first.)
  sudo npm install -g bower