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/
No, we really proxy everything from the minion in the transport, but there is a limit on which responses should be post process. The reason is that I have to modify href from remote FileServer to point to proper minion:/path by regenerate a html doc tree. I have a concern on memory usage for large log file.