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

setup.py

@@ -0,0 +1,18 @@
+from setuptools import setup, find_packages
+
+setup(
+    name='datasite',
+    version='0.1',
+    packages=find_packages(),
+    package_data={'datasite': ['templates/*.html']},
+    include_package_data=True,
+    install_requires=[
+        'click==6.7',
+        'sanic==0.6.0',
+        'sanic-jinja2==0.5.5',
+    ],
+    entry_points='''
+        [console_scripts]
+        datasite=datasite.cli:cli
+    ''',
+)