PostgreSQL upgrade

Standing on the shoulders of the other poor creatures trodding through this muck, I was able to follow these steps to get back up and running after an upgrade to Yosemite:

Assuming you've used home-brew to install and upgrade Postgres, you can perform the following steps.

1. Stop current Postgres server:
   launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
2. Initialize a new 9.4 database:
   initdb /usr/local/var/postgres9.4 -E utf8
3. Install postgres 9.3 (as it was no longer present on my machine):
   brew install homebrew/versions/postgresql93
4. Add directories removed during Yosemite upgrade:
   mkdir -p /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/touch /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/.keep
5. run pg_upgrade:
   pg_upgrade -v -d /usr/local/var/postgres -D /usr/local/var/postgres9.4 -b /usr/local/Cellar/postgresql93/9.3.5/bin/ -B /usr/local/Cellar/postgresql/9.4.0/bin/
6. Move new data into place:

   cd /usr/local/var
   mv postgres postgres9.3
   mv postgres9.4 postgres

7. Restart Postgres:
   launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
8. Check /usr/local/var/postgres/server.log for details and to make sure the new server started properly.
9. Finally, re-install related libraries?

   pip install --upgrade psycopg2
   gem uninstall pg
   gem install pg