Support aws-sdk facility to load credentials from ENV vars or IAM Instance Profile by making the credentials non-mandatory
Merge pull request #7 from ThoughtWorksStudios/master

Load aws credentials from env vars or instance profile
Fix issue #7 related bug.
use Yajl instead of to_json
v0.2.3
Set content type when writing file to s3
Merge pull request #8 from ThoughtWorksStudios/master

Set content-type when uploading to s3
v0.2.4
Add format_json and time / tag mixin options. refs issue #9
Improve format_json option handling
Merge pull request #10 from fluent/support-format-json

Support format json
v0.2.5
Configurable and dynamic S3 object keys
Add use_ssl configuration to disable HTTPS

This configuration is useful for sending the logs to S3 compatible system.
The default is still true.
More better boolean option handling for use_ssl option
v0.2.6
Merge pull request #12 from Furyu/customizable-s3objectkey

Add support for fully configurable and dynamic S3 object keys
s3_object_key_format uses %{...} instead of {...} for formatting to be compatible with other plugins' formatting options
Fixed the issue that all the variables in s3_object_key_format goes empty
Revised the readme to reflect actual variable names for s3_object_key_format