Add in TLS cipher picking patch for mutt.

Using the patch from http://dev.mutt.org/trac/ticket/3167 enables the
picking of ciphers in mutt to something better.

set ssl_ciphers = "ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-SHA"
Gives you http://cl.ly/image/2F1S122L0V0I when connecting to GMail.
Update readme with the TLS cipher patch info.
Merge pull request #1 from mrtazz/tlscipherpatch

Add in TLS cipher picking patch for mutt.