Bug 924475 - [Messages] The context menu is missing the contact name and mobile type

* Carrier name is not included in [the spec](https://bug896368.bugzilla.mozilla.org/attachment.cgi?id=786182)
* Separator is a `,` not `|`
* Some styling was being overridden by root.css (as the suggestion is in an `a` element)
* Contact photo not yet added
* Number in header not yet removed.