Previously we were using the tab's ID to decide if it was the root tab
(that if deleted would close the browser). However our ol' "friend" the
Firefox Privacy tab can sometimes take the TAB ID=1 hotspot, so now we
just have to call out to the browser to ask it how many tabs are
currently loaded, this is more reliable.
Using the `-http-server` argument will now start Browsh in HTTP Server
mode. It will accept request like this:
`curl brow.sh/http://news.ycombinator.com`
This will return a plain text version of the Hacker News front page,
with a width of 100 characters, with each line separated by a line
break.
After moving to Tcell and implementing its screen diff updates, we can
no longer watch STDOUT to get frames during integration tests. Instead
we need to use Tcell's SimulationScreen and which has a GetContents()
method. This is actually also a much more robust way of being able to
see what Browsh actually outputs during testing.
