This is a very small patch release to fix a failing test on CRAN.

This release includes a number of user-visible changes, mostly expanding functionality with some new functions and arguments. It also includes a number of (mostly minor) bug fixes.

User-visible changes

• put_object() and put_bucket() now expose explicit acl` arguments. (#137)
• get_acl() and put_acl() are now exported. (#137)
• Added a high-level put_folder() convenience function for creating an empty pseudo-folder.
• save_object() now uses httr::write_disk() to avoid having to load a file into memory. (#158, h/t Arturo Saco)
• s3sync() gains a direction argument allowing for unidirectional (upload-only or download-only) synchronization. The default remains bi-directional.
• New functions put_encryption(), get_encryption(), and delete_encryption() implement bucket-level encryption so that encryption does not need to be specified for each put_object() call. (#183, h/t Dan Tenenbaum)
• Bumped aws.signature dependency to v0.3.7 to take advantage of automatic credential loading. (#142, #143, #144; #184, h/t Dan Tenenbaum)
• The base_url argument in s3HTTP() now defaults to an environment variable - AWS_S3_ENDPOINT - or the AWS S3 default in order to facilitate using the package with S3-compatible storage. (#189, #191, #194)
• put_bucket() now errors if the request is unsuccessful. (#132, h/t Sean Kross)
• Remove usage of endsWith() in two places to reduce (implicit) base R dependency. (#147, h/t Huang Pan)

Bug fixes

• put_bucket() only includes a LocationConstraint body when the region != "us-east-1". (#171, h/t David Griswold)
• Signatures are now calculated correctly when a port is specified. (#221, h/t @rvolykh)
• acl argument was ignored by put_bucket(). This is now fixed. (#172)
• Fixed a bug in the internal function setup_s3_url() when region = "".
• Fixed a bug in s3write_using(). (#205, h/t Patrick Miller)
• Fixed typos in s3sync(). (#211, h/t Nirmal Patel)
• Fixed a typo in setup_s3_url(). (#223, h/t Peter Foley)

This is a beta release of the aws.s3 package to CRAN.