move to latest AWS sdk (1.8.11)
Custom AWSCredentialsProviderChain for the S3 storage module: supports existing druid config, file, environment variable, system property, profile and (most importantly) instance profile based credential options
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
make the inner provider classes static
Merge remote-tracking branch 'upstream/master'
Merge pull request #837 from gnethercutt/master

Support more AWS credentials providers for S3 storage