Add a few things to .gitignore.
Add command line tool.

This is a little more convenient than doing python -m iron_blogger2.app
(for example).
Link to blogs from /bloggers.

This should have been happening already, but the template was
referencing url, not page_url.

It is disturbing to me that the page even loaded -- this should be
treated as a strict error.
Add a few more things to .gitignore.