Add the creds_envvar() function

[rich-iannone]

This adds the creds_envvar() credential helper function. It's a variation on creds() (manual specification of values). The difference here is that the password can be specified in terms of an environment variable, using Sys.getenv() internally to obtain the password value. The required value for the pass_envvar arg puts it at the top of the argument signature.

Fixes #149

[jcheng5]

Verbiage changes

[mraess]

Hey Rich,

I tried the creds_envvar() function but I'm getting this error even when supplying the password directly into the function and not via Sys.getenv()

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Error: The environment variable defined by pass_envvar doesn't exist.

This is my code:

blastula::creds_envvar(user = Sys.getenv("email_user"), host = "smtp.sendgrid.net", port = 587, pass_envvar = Sys.getenv("email_pass"))

Is there anything else I need to be doing?

[jcheng5]

Try pass_envvar="email_pass"

[mraess]

That worked! Thanks a lot!

[mraess]

Oh one more question - is there a way to do custom css for the emails, i.e. change background color, add a logo in a corner, etc?