Various issues with PostgreSQL

PostgreSQL issues

Run `postgres -D /usr/local/var/postgres` to diagnose issue

If it returns error: 

```
FATAL:  database files are incompatible with server
DETAIL:  The data directory was initialized by PostgreSQL version 9.2, which is not compatible with this version 9.0.4.
```

Then run `brew postgresql-upgrade-database`

Run `postgres -D /usr/local/var/postgres` again.

If it returns the following:
```
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 67646) running in data directory "/usr/local/var/postgres"?
```

Then run: `rm /usr/local/var/postgres/postmaster.pid`