only attempt shared creds load if path is a file
Merge pull request #2305 from raphaellig/shared-credentials-load-fix

Only attempt shared creds load if path is a file. Fixes #2305.
Update failing test
Add multipart upload section to S3 tutorial
Merge pull request #2308 from danielgtaylor/multipart-tut

Add multipart upload section to the S3 tutorial. Fixes #2308.
s/existance/existence/
Add documentation for delete_hosted_zone.

Added documentation for delete_hosted_zone and add return type documentation for get_zones.
Merge pull request #2315 from jianli/develop

s/existance/existence/
Merge pull request #2316 from ttacon/develop

Add documentation for delete_hosted_zone. Fixes #2316.