Fix post settings photo popover position

Popover is now well centered after rotation
Set post settings tableview as grouped
Code style
Pass around the NSManagedObjectID for a topic instead of an entity.
Convert tabs to spaces.
Let reader post detail and rebloging view controllers handle their own images.
Prime the share activity when its safe.

Avoid a visible performance hit later if scrolling.
Added Content-Security-Policy to the default preview HTML template
Updates no results view.

Shows "Fetching posts..." status and fixes an issue with the no posts message flickering briefly.
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.
hides "lost password" when not usable
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.
Updated the editor pod to 0.1.6
Fix bug where session_count wouldn't be incremented on app resume.