Replaced Windows line breaks by Unix line breaks and tabs by 4 spaces
fixes #33 MailResult can now wrap an exception
Updated README documentation with new MailResult features
Updated config file to handle the new attachments system
Created AttachmentsOptions and updated MailOptions to use them
Updated MailOptions deprecated methods to map the new ones for retrocompatibility purposes
Created tests for AttachmentsOptions
Added tests to check the old attachments_dir option is mapped to attachments => dir => path
Updated MailServiceFactory to attach files with the new attachments system
fixes #34 Merge attachments into develop
Updated README documentation with the new attachments system