[#31] Change to system 'Done' bar button item instead of an item with 'Done' text
[#31] Tweaks to the UITableView separators in the root news view controller
Make sure to use the right property
Must call super's prepareForReuse as well
Add Nibs and nib/identifier constants for the 'LoadMore' and 'External' image-less story cells
Don't assume the story will always be in the correct context.

Just grab it from the current context to be certain.
Forgot the pbxproj modifications for commit 65b5e0fdff49150abd903c5e8c1a5579b1df707c
Allow the cell's owner to just set a story object directly instead of manually changing each of the UI elements
Update the NewsImageRepresentation entity's 'image' property to be to-many instead of to-one.

Multiple images with the same URL were parsed and the to-one relationship kept removing itself resulting in vanishing images.
Change the sorting to use a rect's diagonal instead of the area.
Add a type-less wrapper for the setStory: method.
[#31] Fixes to cell sizing and search behaviors

- Overhaul how dynamic cell heights are calculated
- Dynamically adds/remove the UISearchBar when needed
- Make the search UIBarButtonItem always visible
- Fix update behavior; should now show 'Updating..." when an update begins
[#31] Copy dynamic cell sizing code to category view controller

- Searching is currently broken!