Use unicode escape sequence for file type
Add integ tests for #718

The root cause was in botocore which has its own tests, but
this verifies that we can upload/download/sync files with spaces
as expected.  Depends on boto/botocore#264.
Merge branch 'issue-718' into develop

* issue-718:
  Add integ tests for #718
  Use unicode escape sequence for file type
Add s3 whitespace issues to changelog