Rename file and class Filestorage::LocalFilestorage -> Filestorage::Local.
lib/filestorage.rb: require 'filestorage/local' instead of 'filestorage/local_filestorage'.
Rename file and class Filestorage::S3Filestorage -> Filestorage::AmazonS3.
lib/filestorage.rb: require 'filestorage/amazon_s3' instead of 'filestorage/s3_filestorage'.
README.md: Update.
filestorage.gemspec: Add dependency 'aws-sdk'.
Up to v0.0.4.