Removing duplicate boto.s3.prefix entry to prevent Sphinx build errors.
Merge pull request #1707 from oozie/s3_prefix_doc_dedupe

Removing duplicate boto.s3.prefix entry to prevent Sphinx build errors.
Adding API reference for boto.swf.layer2.
Merge pull request #1712 from oozie/swf_l2_ref

Adding API reference for boto.swf.layer2
Fixes #1679, #1566 - Altered DDBv2's ``batch_write`` to appropriately queue & retry unprocessed items.
Added ``dry_run`` to. All. The. Things.
Merge branch 'ec2-dry-run' into develop
Merge branch 'ddbv2-batch-write-fix' into develop