Convert Installer to module.

First full fledged example of converting a page/route in the application
into it's own self contained module. Note that this module declares all
its depedencies. Ideally, the root module shouldn't need to declare any
dependencies.

Note that an unfortunately side effect is that every module has to be
individually included in index.html. Perhaps a build system might be
helpful for this. Also updated bootstrap to latest (3.1.1).

The original installer was split into two html files. I've merged them
into one since the two separate pages doesn't seem necessary.

There's a backend issue where the installer doesn't work because the
database wasn't created.
Small fixes.

os.access() returns boolean anyways.

settings.py shouldn't use root account to access database.

Remove TODO for convenience when grepping.
Add install.py for database initialization.

Turns out that we need to initialize the database with user roles before
we can create the admin user.