`OGImageFileTests` test failing.
`OGImageFileTests` test passes.
Add assets-library support + Test.
Merge pull request #2 from origamilabs/file-url-support

[FIX #1]
[#1] Fix orientation when loading from assets library.
Add a method to purge individual entries from the cache. Fixes #3.
Add a method to purge just the in-memory cache for an image
Merge pull request #4 from tonyarnold/feature/3-add-individual-purge-method-to-cache

Add a method to purge individual entries from the cache. Fixes #3.
Fix `key` should not be MD5'ed in `init`
Merge pull request #5 from origamilabs/bugfix-md5

Fix `key` getting MD5-ed in `init`
Fix shouldn't scale when to/from sizes are the same.
Merge pull request #6 from origamilabs/return-same-size

Fix shouldn't scale when to/from sizes are the same.
Fixes crash, but breaks aspect fill in some instances.
Update comment about the crash and workaround.
Merge branch 'fix-crash' into develop

Conflicts:
	OGImage/OGImageProcessing.m
[FIXES #8]

Multiple requests for the same URL will now only result in a single network request. No changes to the `OGImage` and subclasses' interfaces. Changed the interface to `OGImageLoader`
fix thread-safety for delegate array access and delegate calls
fix bug in idempotent test
Merge pull request #12 from origamilabs/bugfix-8

[FIXES #8] Idempotent network requests
[FIXES #9]

If multiple requests for the same image processing combination are made (image + size + cornerRadius), only queue up one actual processing request and simply notify the callers. This doesn't change the interface or behavior of `OGScaledImage`