Get rid of warnings when launching from the terminal

[Jokeren]

I'm seeing the following warnings when launching from the terminal. Is it possible to not showing them to users?

<IPython.core.display.Javascript object>
Warning: Roundtrip module could not be loaded. Requires jupyter notebook version <= 7.x.

[cscully-allison]

I'll take a look at this. Should be easy to suppress. Maybe an option in the constructor, but otherwise shouldn't be a problem.

[adam-mcdaniel]

^ I'm also running into this issue.