Add host username

[codysherman]

Display the host's username on the page.

[codysherman]

This idea needs to be fleshed out before anyone starts on it.

[sammoore]

What if we just called it "name" instead of username, such that it doesn't imply uniqueness, and throw it into the options when starting a stream / in one of the meta properties for the stream (like where we are going to put the type of room in #173)?