v0.1.17: Cleaner tests! Blueprints! Fix reference links!

General cleaning in docs and tests and general code.

Update travis to reflect removal of Docker
scripts/new recommended commands.

add create_app(): change code to use this flask
app factory. Implement flask blueprint.
Modify runserver.py to reflect this. Had to
change url_for to reference the blueprint name,
e.g., manage_cookie -> app.manage_cookie.

Fix reference_links() issue where it would add
a reference link inside a link, e.g., [see u @3:30](http://example.org/events/234) would get
turned into something like <a href="http://example.org/events/234">see u <a href="/threads/3">@3</a>:30</a>.

Move make_tripcode() to postutils.

No more html5lib crud.

Add more verbosity to pytest mode (docker
entrypoint.sh).

Implement real model tests. Work in progress.

And more stuff but I'm just too lazy to enumerate it all.