Added swipe to delete to saved pages items.

Initial saved pages interface.
Temporarily pages are saved by long-pressing the temporary disk icon.
The saved pages list is toggled by tapping the same icon.
Note that this disk icon is temporary and it hides the search box
clear icon.

Stub button for saving pages and toggling saved pages.
Note: this toggle icon blocks the search box's clear button. Issue will go away when save is moved to a yet-to-be-designed menu.

Refactor search nav and results into own controllers.

Re-routing web view image data to our article data store.

Change-Id: I8ab6f4433e90454b9d525f29b5ba124748e91e52