Add table view category and add a table view to the pdf view controller

Fix the stack corruption produced by the navigation controller delegate, add code to show the image in the detail controller, and begin refactoring the table view code

Use dispatch_once to only load the images once into memory, and remove the images from this array when deleted in the table view

Refactor PapersViewController for the PDF creating and GPUImage methods

Delete Core Data managed classes and create new Image and PDF subclasses

Replace ALAssetsLibrary with PhotosFramework for image fetching

Add PDF drawing code to main controller, UIWebView for showing the PDF to detail controller

Add PDF drawing code to the PDFClient class

Delete tessdata link from project

Delete tessdata from Tesseract

Customize UITabBar colors etc.

Refactor AppDelegate for the correct setup of the App

Change Delegate to use a TabBarController, two NavigationControllers and two TopViewControllers

Put the AlertController helpers to the Utility class

Refactor the PapersViewController class: write a helper to generate AlertControllers with custom method selectors