Add support to query kubelet's logs and cadvisor's stats through apiserver by passing rawquery

* Also add a thirdparty library: code.google.com/p/go.net/html since it is required to override customized Transport for apiserver Proxy to update HTTPResponse pointing to proper minion.
* Now minion information can be queried as: 1) id=${minion}&query=/stats// or 2) id=${minion}&query=logs/
I think I would prefer if you served all proxy like things from a path that starts with /proxy/. As maybe in the future we'll want to do the same for other system components, and it'd be nice to have a logical place to put it. So ```/proxy/minion/\<minionid\>/\<forward everything else to minion\>``` is my suggestion.