Add the ability to process contiguous WebIDL blocks

@darobin

Resolves #334, which also has more discussion of the idea.
On 19/12/2014 00:09 , Jeffrey Yasskin wrote:
> Do you want me to change all |==|s to |===|s? I wasn't sure what the
> convention was.

I tend to stick to http://contribute.jquery.org/style-guide/js/#equality 
for equality.

-- 
Robin Berjon - http://berjon.com/ - @robinberjon