Initial commit for EML mail store
Added first implementation of mail store.
Implemented EML message loading.
* EMLMailStore improvements:
Writing data directly to file to reduce memory consumption for messages with attachments
Handling special chars on message subject to avoid errors creating the file
Adding support for command line arguments (help, choose mailstore, etc)
Updating version information
start getting EMLMailMessage under a test
added some more test coverage to EMLMailMessage
Delegate EMLMailMessage mail message behavior to MailMessageImpl.