Remove the create from createXchannels 

This pull request depends on the changes I tagged as 0.1.0 in the jschan repo,
but was unable to publish due to ownership on npm.

I linked the package, and changed all the occurrences here, but the tests broke. 

Can you check if you can see a quick fix @mcollina? I don't have time to dive into
it more deeply right now.