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/
Ah, I see what you mean. In that case, I suggest that you switch on the Content-Type header instead of the path. Also-- if the http package you're using is any good, it should not need to cache everything before it starts processing and rewriting, so server memory shouldn't run out. But that may be wishful thinking on my part :)