Add cc and bcc options

[MickvanhetNederend]

Great package, thanks. Just added the cc and bcc options (#52)

[johanbrook]

Cool, thanks @Gekkejager!

There's no need to manually edit the HTML docs file though – I'm using docco to generate the HTML from code comments. So please discard the diff in the HTML file, and add appropriate docs as code comments instead, and I'll update the docs myself (see https://github.com/Gekkejager/meteor-emails/blob/master/update-docs.sh).

[MickvanhetNederend]

@johanbrook thanks for your quick reply!

That makes sense. Since the other properties (subject etc) aren't elaborated and cc and bcc are rather self-explanatory I reckon no comments are required?

And how about the README.md, is that something I should alter by hand?

First PR from my side, sorry for the noobish questions.

[johanbrook]

@Gekkejager No worries at all :) I'll take care of the README and docs stuff. Thanks again.