Support for Base64-encoded binary response bodies.
Merge pull request #7 from square/puls/base64

Support for Base64-encoded binary response bodies.
Merge branch 'master' of https://github.com/square/objc-mocktail into ImageMockFunctionality

Conflicts:
	Mocktail/MocktailURLProtocol.m
Merged changes. Now has the ability to use base64 encoding in the .tail file or drag image file into a project or use a folder on the filesystem to map to the images for mocking. Also fixes a small issue when a user has more than one .tail file and one file has a placeholder and the other does not.