Title gets cut off in Juno but normal from separate window

I am using the example of `linescatter2()` and find that:
In Juno, title is cut off,

However, in the separate window from REPL, everything is good, as fixed in [#131](https://github.com/sglyon/PlotlyJS.jl/issues/131)

I find that the default margin set is different in both situation, wherein Juno is
`"margin": { "l": 40, "b": 30, "r": 10, "t": 10},`, in REPL is `margin": { "l": 50, "b": 50, "r": 50, "t": 60}`. I am not sure why it is not consistent.

I am using Julia v0.6.3, everything else, including package, Atom, etc., is up-to-date.

Reproduce the `linescatter2()` example in Juno and in the separate REPL window, then compare the reported default margins and title rendering. Use issue #131 as the prior reference; done means the title is fully visible and the default margins behave consistently in both environments.

Written by the indexing model from the issue text.