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'd suggest we make this longer-- like /minionproxy, to make it very different from /minions.

Also could consider using the path:

/proxy/minion/<minionid>/<path on minion>