Make copyFile take s3.copyObject options (#167)

* Make copyFile take s3.copyObject options

* Fix test so that it returns `true` to show that the function is satisfied. Also added Metadata to the object being copied and verified it comes back.

Pull in Fix for Infinite Loops On Directories With 100+ Items (#139)

* Fix marker  used for continuation of directory listings when the number of files exceeds the maximum returned per request (default = 100).

* Change recursive listAllObjects calls to use the correct value for the continuation marker, when the previous call did not return all remaining values.

* Switch to using AWS.CredentialProviderChain() to resolve credentials for tests - allows users working in a VPC to set a session token for access.

* Tests for listing files and objects where more results are available than will be returned by a single call to the S3 API.

* Update how we handle S3 credentials to allow the AWS SDK to do all the work of figuring them out. Cleanup tests some to be more succinct.

* Turn on `es6` for linting.

Update dependencies in `shrinkwrap` (#100)

Bump version for maintenace release.

Merge pull request #59 from RiptideElements/greenkeeper-update-all

Update all dependencies 🌴

Merge pull request #58 from RiptideElements/deps

Update `bluebird` and `aws-sdk`

Bump version.

Merge pull request #51 from RiptideElements/update-aws-sdk

Update version of AWS SDK

Bump version, add `.npm-ignore`

Merge pull request #39 from RiptideElements/encoding-support

Update Read/Write File to Operate more like Node's FS