fix comet to work after returning to page via back button
added comet option to send {comet, Mode, Msg} to the callback.
annoying debug prints commented out
width, height to image
Merge branch 'master' into devel
Add placeholder to password
Merge remote branch 'x0id/comet_fixes' into devel

Conflicts:
	src/actions/action_continue.erl
Convert #upload{} use uploaded_file from simp brig
error_handler is not a builtin Erlang or Nitro mod
Add stack trace to continue error. Fix indenting
Fix commas being removed from button values
Add #option_group element and #option shortcut
Allow iolist as src for #image
Remove cellspacing=0 and cellpadding=0 from table
Version bump to 2.2.0-pre