* replace boto with boto3 for the s3 module
make s3 pep8 and remove from legacy files
fix s3 unit tests
* fix indentation
* s3 module - if we can't create an MD5 sum return None and always upload file
* remove Location.DEFAULT which isn't used in boto3 and tidy up the docs
* pep8
* s3: remove default: null, empty aliases, and required: false from documentation
fix incorrectly documented defaults
* Porting s3 to boto3. Simplify some logic and remove unused imports
* Fix s3 module variables
* Fix a typo in s3 module and remove from pep8 legacy files
* s3: add pagination for listing objects.
Fix logic and use head_object instead of get_object for efficiency.
Fix typo in unit test.
* Fix pagination to maintain backwards compatibility.
Fix incorrect conditional.
Remove redundant variable assignment.
Fix s3 list_object pagination to return all pages
* Use the revised List Objects API as recommended.
* Wrap call to paginated_list in a try/except
Also remembered to allow marker/prefix/max_keys to modify what keys are listed
* Simplify argument
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