Automatically employ multipart upload when size exceeds threshold
Pass verbose option through to Target
Improve presentation of debug messages
Assign 'verbose' property in constructor
Pass verbose option through to Target
Provide for new config file 'accept' option
Logic for new config file 'accept' option
Provision for post-backup cleanup of the target
Refactoring of single & multipart upload and multipart abort
_store_chunk implemented using, and retry logic moved to, Target::Amazon::S3.
Cleanup method implemented.
Merge branch 'development' of github.com:NewsNow/brackup-nn into development

Conflicts:
	brackup
	lib/Brackup/Config.pm
	lib/Brackup/Target.pm
	lib/Brackup/Target/Amazon.pm