Add Fig manifest for services

Use `fig` to power the service dependencies of the application:

- Elasticsearch 0.20
- Redis

Boot it with `fig up -d` and adjust your local configuration `.env`
file to use the proper ip:port of each of them.
Update populate task to include extra CSV attributes

In order to properly compute PUE/WUE values, we need extra UtilKWh,
ITKWh and TotalWaterUsage.

Update the populate task to fake those values and be usable again.
Make Redis an explicit dependency (and update to latest)

There was no explicit declaration of Redis in `Gemfile`, however
it was used by `Power` as cache storage.

List it explicitly and ensure is on latest available version.
Update Elasticsearch and related dependencies
Work with latest Elasticsearch
Indicate Elasticsearch compability
Merge pull request #3 from facebook/ticket-73

Verify incompatibilities with newer Elasticsearch