Include some room history

[anaskaejdar]

It's easy to grasp the context and follow the conversation in Riot because you can see several messages at once and in order. It'd be nice if each email included some message history, maybe 8-12 messages, so the email user can better grasp what's happening. It really sucks to only see one message at a time, and then have to back out and select the next message, especially on a mobile client.