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 hope you'll consider my suggestion about switching to a ```proxy/minion/<minion id>/...``` system. But if not, I feel that the parameter should be "path" or perhaps "rawurl", not "query"; query specifically means the part of the url string between the ? and # characters, but you're sending a path.