Added a couple features

[ses4j]

I needed a "# of lines" estimation for when the tinymce text gets published into an output PDF report. Your plugin almost fit the bill, I just tweaked it slightly to add a "lineCount" and to be able to plug in my own status line template, like this:

....
s_textmetrics_on: true,
s_textmetrics_template: function (ed, t) { 
    return '<span>Using an estimated <span id="' + t.lcid + '">0</span> line(s) out of a recommended max ' + settings.recommendedmaxlines + '.</span>';
s_textmetrics_charsperline: 50,
s_textmetrics_updater: function (t, d, m) {
    var lines = m.lineCount;
    d.setHTML(t.lcid, (lines > MAX_LINES) ? ("<span style='color:red'>" + lines + "</span>") : lines);
},

Pull it if you want -- if you need me to tweak it for acceptance somehow I'm happy to, just let me know.