Binary Sync Pull Request

*Implementation Details:*
- Implemented SPHttpRequest, to handle uploads / downloads
- Implemented SPHttpRequestQueue. Works along with SPHttpRequest. Handles retries, and takes care of limiting the number of active sync operations.
- Updated SPBinaryManager. Internal API exposed in SPBinaryManager+Internals.h.
- Implemented SPMemberBinaryInfo class.
- Nuked old S3 sync code.
- Unit tests implemented in SimperiumBinaryTests class.

*Client App Requirements:*
1.	Two attributes required
		[name]	   :: Binary Data type
		[name]Info :: String type
2.	Toggle 'Save External' property (CoreData model)
3.	Use Case Example
		NSData *picture = nil; /// Just a sample
		post.picture = picture;
		[mainMOC save];