Remove workaround for AFNetworking bug.

Bug was fixed in AFNetworking.
Fix uploading images with orientation info.

We were unnecessarily swapping the width and height before rotating the image.
Add reply menu item for pasting an image.
Add reply menu item for pasting a URL.
Settings sections can have predicates.

The whole section only appears if the predicate returns YES when evaluated
against the settings view controller.
Add setting for using dev.forums.

For those who have access, Awful can use features available on
dev.forums.somethingawful.com that aren't otherwise available.

For those without access, they'll never get the option.
Tear down the UI completely when logging out.

Previously, any existing view controllers etc. would stick around after logging
out. This was a problem for any user-specific instance variables (such as the
settings view controller's canReachDevDotForums), as they weren't being
regenerated when a new user logged in. Now we recreate all view controllers.
Formatting.

Also do the weak/strong dance for a block.