Merge pull request #231 from jasobrown/1.1

switch from internal Throttle to guava's RateLimiter. #229

reviewed by @timiblossom
questionable test Ignored
First pass at fixing the s3 client TimeoutConnections problem.
call s3client.getObjectMetadata() directly, rather than getting sn S3Object first.
Getting the S3Object eagerly opens the TCP connection, which we don't need at all
in the S3FileSystem block.
Merge branch '1.1'

Conflicts:
	priam/src/main/java/com/netflix/priam/aws/S3FileSystem.java