Possible improvements of the JuliaCon LateX class

[Azzaare]

This issue follows some remarks left on the juliacon channel on Slack

1. The code environment does not wrap code to a new line at the value corresponding to the width of the environment, so we do have to tweak things manually (which is not horrible). Maybe we could solve things by adding a submission style in JuliaFormatter.jl that include the exact width (seems to be 63 characters)
2. I, personally, find the itemized bullet style terrible as there is no space at all between the hyphen and the first character following it. I would not complain if we have something different (a simple bullet would do …) from next JuliaCon.

Note that these are very small and not important complaints. I do love the juliacon logo on top