Make reverse work with examples and add more tests.

[thomasyip]

I added examples folder to the project.

You can start the examples with these command after checking out the newest version.

git checkout master
git pull
git submodule sync --recursive
git submodule update --recursive --init
./bin/examples runserver
# open browser http://127.0.0.1:8000/

You will able to see the first page loaded.

Now, edit ./submodules/storeys/examples/apps/receipts/templates/receipts/list.html and add:

a) a new link <a href="{% url 'receipts-create-view'' %}>Create a new receipt</a>
b) another one <a href="{% url 'receipts-item-view' 10 %}>Receipt 10</a>