If dynamic-javascript is enabled and we see HTML in the display data after
executing a cell, then we create a web page for it in the simple-httpd server.
No longer flag if skewer is running, instead check running status of httpd server.
EIN also is back to asynchronously executing javascript code and does a much
better job of finding where to put the output.
EIN will try to use skewer to execute javascript cells, which works for
the most part. Those hoping to have widgest or something like d3 working
are going to be disappointed, however, as at its heart ein is not an
HTML page and those packages depend on modifying the DOM of the notebook
web page.
It remains to be seen if those issues are surmountable, but for the
moment this functionality will live in this branch and this branch
alone.
