[patch] auto detect hostname for remote preview

[LeaYeh]

auto detect host from browser's URL to create web socket instead of fixed localhost
Issue: #28

[hallzy]

I would like to try this, but I am not super familiar with any of this. I made the change in the index.html file but I am not sure what else I need to do to get this working. Just changing the line did not work for me so I guess I need to also do something else but I don't know what that is.

[hallzy]

I ended up just forking it and rerunning the command and that seemed to work. If you have a better way let me know. Thanks for this line change though :)

[suan]

@LeaYeh Thanks! This is a simple and elegant change and shouldn't break anything, so I'll be merging.

But to clarify, you had to make some changes similar to hallzy@8702f89 to prevent the initial window from opening on the machine, for this to work at all, right?