FtpExecutor: Nice Exception if input stream is null
Release set to 0.9-RC1

SDI-example-customer:
  - Updated from my private customer application (where I have tested until now)
  - All property settings generalized
  - The SocialDataImporterLauncher (in test) runs now without failure (Note: for running within eclipse you have to provide some command line params, see comment in SocialDataImporterLancher class)

SDI-core:
  - mail.properties: property sdi.mail.class.name deleted
  - MailTextResolver: nice Excaption if a property cannot be resolved properly

SDI-plugins-oxwall:
  - OxFtpJob: When dry-run is true, no connection attempts to FTP and SSH server are performed