[dev] development (logger && web inspector) patch

Hi, hopefully this patch will be useful for those doing web development
with surf or hacking surf itself. Briefly:

-l <L> set stdout log level L as described in

http://library.gnome.org/devel/libsoup/unstable/SoupLogger.html#SoupLoggerLogLevel

-n enables web inspector

http://trac.webkit.org/wiki/WebInspector

By default both options are turned off.

Best regards

--
Carlos