Fix editing, replying, and posting when "Hide Google/Amazon Search Bars?" is set to "no".

We were scraping the wrong form, as I'd naively assumed the first form was
always the right form. Now we're looking for parameters we expect to find,
which seems less fragile in general.
Update thread's last post date/user when scraping last page.
Fix loading pages that are not encoded as win1252.

Sometimes I guess SA's response headers don't lie?
Don't crash when locating posts.

Passing a string where a post was expected is not helpful!
Open profile links within Awful.
Indent subforums in forums list with a horizontal line.

The line grows as we descend the hierarchy.

Indenting with whitespace didn't work very well. Either the indent squished the
forum name too much, or it was so small that it looked accidental. Adding a
thin line restores the feeling of intent.
Update Crashlytics.
Consistently present/push view controllers.

Browser and profile view controllers should be pushed on iPhone, presented on
iPad.

I also took the opportunity to clean up some boilerplate and fix some
formatting.
Shush GRMustache.
Stop pretending that a settings did change notification ever mentions more than one setting.
Add new expand/contract icons for iPad.
Delete "Theme" label on in-page settings popover.
Theme in-page settings popover.
Replace "rewind" button with simple arrow for "open drawer".
Replace obsolete "font size" icon with switch-like icon.
Fix toolbar tint color in white theme.

Was default blue instead of Awful Blue.
Fade unread count badge out a bit when it's zero.

Since we're using it in two places, extract an unreadPosts property into
AwfulThread.
Bump unread badge away from scroll indicator.
Add thread tag filtering back in.

Fixes #224.
Root view controllers have arrow-only back bar button items.

Just looks cleaner, and it's worthless context.