Eliminate base_standard.html template and internalNavigate blocks

The base_standard.html template was an unnecessary level of template
inheritance.

Also removed unused `min` and `subtract` template tags.

Remove unused podjango files

Also updated the podjango templates to reference the *actual* base template,
`base_conservancy.html`, rather than `base_standard.html`.

Move `SITE_FUNDGOAL` configuration to settings/base.py

This changes more often than the surrounding code, so should live with the other
configuration.

Merge sponsors.py into supporters app, frontpage.py into views.py

Just a small structural change so that the related functionality is grouped together.

Remove remaining jQuery

This avoids every page on the site parsing 250KB of JavaScript.

supporter-page.js isn't the most elegant code, but at least it's a little more
modular now and no longer user jQuery.

Replace complex expanding JS with native <details> elements

Have retained the "expand all" behaviour - just with less code.

Remove use of jQuery in conservancy.js

This is the first step towards removing jQuery from the site.

Merge "supporter" and "supporters" apps

It's a little confusing having both a "supporter" and "supporters" app. This is
a fairly minor change to move the sustainer banner urls/views into the existing
"supporters" app. The functionality isn't directly related, but it is all about
sustainers.

podjango: Add "Podcast" model to support multiple podcasts

Each Cast (episode) can belong to one or more Podcast, allowing episodes to be
shared between podcasts. This enables us introductory episodes to be delivered
in their own feed, but also included in the main "The Corresponding Source"
feed.

This required adding an additional `podcast_slug` argument to most views. The
date archive views were dropped because they're not linked to from anywhere.

Added a `podcasts` view as an index of all available Podcasts.

contacts: Remove ContactEntry and add Unsubscription

This change removes the unused `ContactEntry` model and the `subscribe` view and
replaces it with an `Unsubscription` model and an `unsubscribe` view. It works
similarly, but is intended to be used with the `list-unsubscribe` and
`list-unsubscribe-post` headers.

Remove summit_registration Django app

Has some typos suggesting that the code was never completed or used.

Defer JavaScript loading

This avoids waiting for the JS to download before rendering the page.

Move the content templates/files into `conservancy/content`

These were previously intermingled with the static content in `conservancy/static`.

blog: Retain author/tag when changing pages in entry_list

Denver noted that the author query string was being lost when you select a page
by page number. This change fixes it.

Move fundraiser calculations to model

This changes simplifies the template and adds correct pluralisation of
hours/hour remaining.

usethesource: Allow logged in users to edit/delete their own comments only

Unless of course they're given the "change comment" and "delete comment"
permissions, with which they can change or delete any comment.

Use decorator syntax to register admin handlers

Same-same, just marginally neater.

Remove unnecessary `admin.autodiscover()`

Since Django 1.7 this is done automatically.

Delegate management of canonical URLs to Apache

This middleware is mostly redundant:

* redirecting to canonical URLs can be done more simply in Apache
* appending a forward slash is a default in CommonMiddleware now
* we're no longer using Squid cache

May need to update Apache to strip/redirect trailing "index.html".

Fix strange issue with ParameterValidator settings

When imported at top-level, `settings` was a Python module, rather than a Django
settings object. Not sure why.

Make bin/deploy abort if there's an error with `git push`

For example, your push failed because there's upstream changes.

Switch settings to use "the one true way" approach

The advantage of this approach is that the production and dev configurations are
in version control, so there's less opportunity for surprises.

As advocated by Jacob Kaplan-Moss (OSCON 2011) and Two Scoops of Django book.

Remove deprecated `ifequal` and `ifnotequal` tags

These have been replaced by `{% if x == y %}` type tags.

Switch from `url()` to `path()`

Path is the new way to handle simpler routing rules.

Switch from "restart apache2" to "reload apache2"

No need to do a full restart. Reload will be marginally faster.

Document the new deployment approach

Also mentioned linkchecker.

Rewrite the `index` view to avoid risk of path traversal

I've simplified this view by removing the custom HTTP error handlers, Python 3.5
exception handling and adding documentation.

Move Python code out of the "conservancy/static" directory

Having Python code in "conservancy/static" is a bit suprising to people familiar
with Django. The name "static" is usually reserved for assets like CSS, JS and
images.

I'm moving `conservancy/static/views.py` to `conservancy/views.py` and removing
`conservancy/static/__init__.py`.

fossy: Add created_time to CommunityTrackProposal model

Also move templates into app.

Fix mistaken rename

I meant to rename the deploy script, not the deploy directory.