Adding xcode arg passthrough
Allow S3 region to be nil instead of empty string

Fixes SocketError: getaddrinfo: nodename nor servname provided, or not known
Fix naming of s3 command in README

Was `S3`; needs to be `s3`.
Makes the dsym file optional for the S3 Plugin

This is in line with the Testflight, HockeyApp, FTP plugins, as well as the log message "Specified dSYM.zip file doesn't exist"
Fix creating empty 'directory' on S3 when not specifying a path
Fix typo
Fix bug when uploading builds to iTunesConnect

The Validation tool's -online and -upload options were removed causing
all iTunesConnect uploads to fail. This uses iTMSTransporter instead.

* Create a Package.itmsp - Application Loader's spec for uploading files
* Write metadata.xml explaining what is contained in the upload
  * Add the size and MD5 sha of the IPA to the XML
* Use iTMSTransporter's -upload option to upload the package
* Clean up the created directory

Note: This requires passing in the Apple ID with the -i or --apple-id
option. This can be found in iTunesConnect under:
  My Apps -> [App Name] -> More -> About This App -> Apple ID
Comment on updated distribute:itunesconnect command
Merge pull request #158 from qmoya/master

Fix typo
[Issue #151] Return nil instead of raise NilOutputError
[Issue #151] Return nil instead of raise NilOutputError
Merge pull request #155 from MaxGabriel/fixEmptyDirectory

Fix creating empty 'directory' on S3 when not specifying a path
Merge pull request #154 from MaxGabriel/optionalDsym

Make the dsym file optional for the S3 plugin
Merge pull request #152 from MaxGabriel/master

Allow S3 region to be nil instead of empty string
Merge pull request #153 from MaxGabriel/patch-1

Fix naming of s3 command in README
Merge pull request #149 from mtauraso/add-xcode-arg-passthrough

Adding xcode arg passthrough
Merge pull request #159 from joemasilotti/itunesconnect-fix

Fix bug when uploading builds to iTunesConnect
Whitespace
[Issue #159] Adding note about lack of Swift support to README
Merge pull request #144 from mikegottlieb/crashlytics

Added plugin to distribute builds on Crashlytics.