Merge pull request #2 from mattandersen/master

Bug fixes and some new command line arguments
Added domain file filter & bug fixes

- Added new argument to filter files by their backup domain, such as "MediaDomain" or "HomeDomain". This can be used to filter for files from a specific application.

- Removes the encrypted file when it is properly decrypted.

- Fixed the location of initializing instance variables in the MobileBackupClient class.