Spidermonkey 1.7 support

Hello,

the master now works ok with spidermonkey 1.7 on the first impression.

However, the wikipedia example/test doesn't work - no output is shown
on the page, and also
no exception or assert is shown.


I tested document.appendChild(document.createTextNode()) which works
well.
document.appendChild(document.createElement('br')), fails with an
javascript assert in an simple html page.

so far and thanks for the work on javascript embedding.

Greets,
Ole