Remove emoji image check.

Emoji needs to be handled via text replacement and not images.
Remove unnecessary size adjustment.

Retriving from the cache will take care of adjust the size (if needed).
Setting the height to 0 here will prevent `resizeImage:toSize` from succeeding.
Add support for using the Photon `fit` method.

Recycls existing photon URL with updated parameters.
Adds support for batching downloads.
Don't change counter or queue in success block.
Adds rich text image control.

A replacment for ReaderMediaView and friends.
Adds a video thumbnail service and rich text video control.

Replacements for ReaderVideoView.
Switches rich text to new image wrangling.

Show images at natural size or smaller.
Use WPRichText controls and not reader media views.
Updates delegates to reference new controls.
A few tweaks and bug fixes.

Corrects white space.
Adds a safety check when fetching items from the pending downloads array.
Use device dimensions when setting max image size.
Remove NSLogs
Check host is not nil before using in regex.
Get the largest youtube thumbnail
Remove batching logic from WPTableImageSource.

Sets a limit on concurrent downloads
Adds logic to `WPRichTextView` to notify delegate to refresh after a batch of images is loaded.
Renames delegate method to better reflect its function.
Restore previous method description.
Show default image when no video thumb.
Undo change in file in pod.
Undo change in file in pod.
More permissive media refreshing.
Removes unused const.
Make sure to not wait on a long download before checking pending.