Javadoc for 1.7.x

Throwing this out here for discussion.

So here's what it looks like if we were to put the Javadoc into git and eventually publish it in svnpubsub. It's ~200 MB worth of Javadoc. :P 

That's a lot of baggage to carry around. The only way it could possibly work is to only ever have the most recent version of the Javadoc online. Hence the 1.7.x. So when 1.7.4 comes out, it would replace what's in 1.7.x right now. Looks like Tomcat does something similar with [their Javadoc](http://tomcat.apache.org/tomcat-7.0-doc/api/index.html).

I'm also wondering if there's some scheme we could use to have it in svnpubsub but **not** in git since it's all just generated anyway.

Thanks for throwing this out there, @everett-toews! Curious to hear your thoughts on why this might be a good place?