Bug 1012663 - [SMS] Remove inline style for CSP compliance. r=julienw
Bug 1025552 - [Messages][Refactoring] Refactor attachment.js and specifically move rendering part to a separate module. r=julienw
Review round#1: more unit tests, more comments, changed naming for attachment content container."
Review round#1: added "encodeURI" for data URL manipulations + added AttachmentRenderer.for method.