Multiple app directories in same bucket

[joshdholtz]

Closes #2

lane :apk1_multi do
  aws_s3(
    bucket: 'fastlane-plugin-s3',
    region: 'us-east-2',
    app_directory: 'android',
    apk: './fastlane/apk1/BanditTheCat.apk',
  )
end

[rpassis]

Hey Josh thanks for these changes.

I've been able to test them and can confirm they work as expected

For the following config

AWS_S3_BUCKET=my_bucket
AWS_S3_PATH=a/b/c

def upload_to_s3
  aws_s3(
      bucket: ENV['AWS_S3_BUCKET'],
      region: ENV["AWS_S3_REGION"],
      access_key: ENV["AWS_ACCESS_KEY"],
      secret_access_key: ENV["AWS_SECRET_ACCESS_KEY"],
      app_directory: ENV['AWS_S3_PATH'],
      upload_metadata: true,
  )
end

The result is the following directory structure:

my_bucket/a/b/c/index.html
my_bucket/a/b/c/version.html
my_bucket/a/b/c/v{CFBundleShortVersionString}_b{CFBundleVersion}/MyApp.ipa
my_bucket/a/b/c/v{CFBundleShortVersionString}_b{CFBundleVersion}/MyApp.ipa.dSYM.zip
my_bucket/a/b/c/v{CFBundleShortVersionString}_b{CFBundleVersion}/MyApp.plist