Started work on cli, which also meant adding setup.py

I'm using click, and click recommends using a setup.py - so I've added one of
those. I also refactored code into a new datasite package. It's not quite
deploying to now properly at the moment though - I seem to have messed up the
path handling a bit.

Also snuck in a new template for the "Row" view.

Refs #40

templates/index.html

@@ -1,13 +0,0 @@
-{% extends "base.html" %}
-
-{% block title %}Databases{% endblock %}
-
-{% block content %}
-<h1>Database{% if databases|length != 1 %}s{% endif %}</h1>
-{% for database in databases %}
-    <h2><a href="{{ database.path }}">{{ database.name }}</a></h2>
-    <p>{{ "{:,}".format(database.total_rows) }} rows in {{ database.tables_count }} table{% if database.tables_count != 1 %}s{% endif %}</p>
-    <p>{% for table, count in database.tables_truncated %}<a href="{{ database.path }}/{{ table }}" title="{{ count }} rows">{{ table }}</a>{% if not loop.last %}, {% endif %}{% endfor %}{% if database.tables_more %}, <a href="{{ database.path }}">...</a>{% endif %}</p>
-{% endfor %}
-
-{% endblock %}