Challenge3/masayuki0812

I added these features:

For DB,
- Normarized city by introducing new `cities` table.
- Modified `house` table schema.
- Introduced `city_energies` table for energy production by each city.

For Application,
- Introduced RESTful API + Client MVC (AngularJS) architecture.
- Introduced Bootstrap for css styling.
- Added new pages for city for list and detail.
- Added a chart for energy production by each city.
- Introduced c3 as a chart library (c3 is my OSS project).

For Test,
- Introduced RSpec.
- Introduced Karma (not implemted enough though).

I deployed the latest version to Heroku. URL is http://edsc3.herokuapp.com/
There might be a latency for the first access because of the sleep of Heroku node.