Updated for ARC & Amazon changes

Updated the project to use ARC, and removed the broken web scraping
functionality, replaced with Amazon lookup using Amazon developer
credentials. Added XMLReader to parse the returned info into an
NSDictionary.
Merge branch 'master' of https://github.com/mindersw/HyperopicBarcode

Conflicts:
	.gitignore
	Classes/Controllers/BarcodeController.m
	HyperopicBarcode.xcodeproj/project.pbxproj