Re: Addition to the HTCache API.

Commited to the base.

Thanks, James!

-Jose

In our previous episode, James Gallagher said:
> 
> I've been working with the HTTP Cache and I needed to be able to set the
> default expiration time from my client. Of course, default expiration times
> for cached items are not a good thing in general, but it seems that if you're
> going to have one at all it might as well be something the client can set.
> Here's a patch for HTCache.html,c that adds two functions which can be used to
> set the DefaultExpiration private member.
> 
> HTCacheMode_setDefaultExpiration(const int) sets the default expiration and
> HTCacheMode_defaultExpiration() returns it.