* Reactlog shortcut was broken due to reactlog.js not being included in
the gruntfile
* Reactlog has always shown every reactive event since the beginning of
the process (or at least since options(shiny.reactlog=TRUE)). This
commit makes it so Ctrl+F3 invocation only shows reactives that either
belong to no session (e.g. observers and reactives declared at the top
of server.R), or belong to this session.
