S3 storage: enable archiving in addition to deleting unused segments
default to archiving segments + docs
add archive task
consolidate path functions
fix docs
better naming
fix cut-n-paste typo
throw exception instead of just printing a warning
update for new interfaces
separate segment mover and segment archiver
separate move and archive tasks
rename SegmentMoveAction to SegmentMetadataUpdateAction
safely move files
add S3 segment move test and fix bug caught by test
Merge pull request #303 from metamx/s3-storage-archiving

S3 Storage: moving and archiving of unused segments