Rolled together a startup of rethinkdb on OS X and a couple of fixes from a tutorial

rethinkdb_tutorial.txt

This tutorial had a few bugs in it:

http://www.rethinkdb.com/docs/tutorials/elections/

---
getting started on Mac OS X...

The first few items are run in the terminal, and while I'm sure there are other ways to load the data,
I just went with what was in the tutorial, which included using the Python driver for Rethinkdb via pip.

After the last command in here, things seemed to just work... so I pass you back to the tutorial page.

brew update
brew install rethinkdb

(start it up!)

# To get the data for the tutorial

sudo easy_install pip

wget https://raw.github.com/rethinkdb/rethinkdb/next/demos/election/input_polls.json
wget https://raw.github.com/rethinkdb/rethinkdb/next/demos/election/county_stats.json

sudo pip install rethinkdb

rethinkdb import -c localhost:28015 --table test.input_polls --pkey uuid -f input_polls.json --format json
rethinkdb import -c localhost:28015 --table test.county_stats --pkey uuid -f county_stats.json --format json

#in javascript using the data explorer (http://localhost:8080/#dataexplorer)

r.table('input_polls').limit(1)
 
r.db('test').tableCreate('polls')

r.table("polls").insert(
    r.table("input_polls")
     .group("id")         // We group the table by `id`, which is the state name.
     .pluck('Dem', 'GOP') // We pluck out the poll results we care about.
     .merge({polls: 1})   // And finally, we add an extra field `polls: 1` to each row.
     .reduce(function(left, right){
        // We reduce over the polls, adding up the results and keeping
        // track of the total number of polls.
        return {
            Dem: left("Dem").add(right("Dem")),
            GOP: left("GOP").add(right("GOP")),
            polls: left("polls").add(right("polls"))
        };
     }).ungroup().map(function(state){
         // We ungroup and divide the fields `Dem` and `GOP` for each state
         // by the number of polls to get the average result per state.
         return {
             Dem: state("reduction")("Dem").div(state("reduction")("polls")),
             GOP: state("reduction")("GOP").div(state("reduction")("polls")),
             polls: state("reduction")("polls"),
             id: state("group")
         };
     })
)

#etc as in the tutorial