[respec] Removed support for exceptions

Hi all,

just a heads up to all of you: since WebIDL has pulled support for the likes of raises, getraises, and
setraises, I've now matched that up in ReSpec and have pulled support for them. The way this works is that in
order not to break existing drafts that use those, I just silently ignore them (they are parsed but no
output is generated for them). The next step, in a decent amount of time, will be to start warning when
they're present, so I recommend updating your drafts to remove them (since it's not valid WebIDL anyway,
it's the right thing to do).

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Robin Berjon - http://berjon.com/ -  <at> robinberjon