Support Django 1.10 with timezone upgrade

Needed as SubfieldBase is depricated

Use django's login_required decorator

This only seems to be here to have some custom login_url used bypassing
django's model. Well as we want to use django's model, this just won't
do. So lets move to using django's model.

django-sitetree >= 1.7.0 and not use version pin

In the future, when we want to lock a package to a specific version, we
will do that via a constraints file in the master project.

Making it difficult to update deps is not okay.

News pages working.

Sponsorship ... getting there.

Default content page and sponsor list is working, mostly.
TODO: get sponsor logos to show up instead of the names (text).

Added some css to make text visible on 404 and 404 pages.
Removed references to non-existent content—page-header-panel.html.

Generate ical description dynamically

Use method instead of class attribute for ical feed description.
This allows the class to be instantiated without a database being
available (eg. during migrate).

Added favicon and special events pdf to bring this up to look/feel of wooden site.

Removed additional (and completely superfluous) styling in app.css that was otherwise making
our site look gluggy.

Mod'd fixtures (and updated db) to reflect PyCon rather than PinaxCon.

A few mods to be able to use the runserver site for debugging. We'll back these out once the real
(via apache) site is up and running.

Getting the splash homepage to work via CMS.

Nearly there. Much rubbish / cruft ripped out of site_base.html and content_page.html.
Had to modify cms_pages/models.py to accommodate a "simple" layout option in the homepage
editor.
Still some stuff to do. Styling not quite there yet, but want to checkpoint this.

Handle slots with no Proposal

* Use the item kind for a title if there's no proposal
* Use the content_override for the description if there's no proposal

The rest of the static stuff is now sorted. (Needed a couple more Alias directives in
the apache2/mod_wsgi config to do this.)

Not sure if this complies with Best Practice. Will check this out ASAP.

Website is working behind apache2 / mod_wsgi in daemon mode.
Only the homepage loads correctly at the moment. Need to get the
static files thing sorted, still.

Mods to settins.py making this less lca, more pycon.
More to come. Many more ...

Started setting up static areas.
- copied lca2017 stuff
- added pyconau2016 files / dirs.

Update requirements.txt

Added symposion to requirements.txt

Tracks which page of the schedule is loaded at any given time (#90)

* Adds schedule fragment script

* removes spurious logging

* Displays the right tab on DOM load.

* Load today’s schedule if we’re during the conference.

* remove TODO

Rooms have optional track names, access schedule by day via URL (#87)

* Optional track name with room name on schedule, access schedule by day eg /schedule/?day=Monday

* Changed to using a Track model rather than a char field

Migration for open hardware CFP (#86)

* Form for Open Hardware CFP

* Oops forgot the migration

Form for Open Hardware CFP (#85)

Loosen permissions on wiki editing. (#84)

Chrisjrn/sponsor logos (#83)

* adds sponsor logos

* add sitkcermule

* Add wargaming

* Add TPAC

adds sponsor logos (#82)

* adds sponsor logos

* add sitkcermule

Adds mobile-friendly schedule view and paged schedule view (#81)

* Adds responsive mobile CSS for schedule timetable

* Adds by-day schedule view

* Displays content_override in schedule

* Adds twitter/homepage links for speakers.