Fixed matching Drive letter in windows for forceEmbeddedImages

https://github.com/andris9/Nodemailer/issues/184
Merge pull request #25 from amitava82/patch-1

Fixed matching Drive letter in windows for forceEmbeddedImages
closes #26:  Allow \r\n to be configurable.
Merge pull request #27 from jsdevel/master

closes #26:  Allow \r\n to be configurable.
Ensure MIME-Version header is always the last one
bumped version
Merge commit '35440cefd7e630a10dee6c7e5fa89795ee49b2b6' into request