Merge pull request naderman#8 from fabdsp/fix/composer-plugin-api

Fix composer-plugin-api requirement

Merge pull request naderman#7 from JJK801/last-composer-version-fix

Last composer version fix

Merge pull request naderman#6 from JJK801/enalble-s3-for-repositories

fix $this

Merge pull request naderman#5 from JJK801/enalble-s3-for-repositories

Add repositories (packages.json) management using S3

Merge pull request naderman#2 from easybiblabs/topics/aws-sdk-version

set AWS SDK version to 2.*

Update README.md

Require a specific composer plugin api version

The download event in composer was renamed to PreFileDownloadEvent

The composer plugin interface was changed to pass args to activate

Add some metadata to composer.json for packagist