Added output of `window.onerror` arguments to test page (waiting for https://mikewest.org/2013/08/debugging-runtime-errors-with-window-onerror in #26)
Added output of `window.onerror` arguments to test page (waiting for https://mikewest.org/2013/08/debugging-runtime-errors-with-window-onerror in #26)

talves/stacktrace.js,auchenberg/stacktrace.js,stacktracejs/stacktrace.js,qiangyee/stacktrace.js,oliversalzburg/stacktrace.js