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/
Actually query parameters passed to APIServer is not order-sensitive since I am using url.ParseQuery here. The transport function hijack the HTTPResponse to update href pointing to corresponding minion in case the user click those href links. Also if you want to retrieve a certain log file under minion:/var/log/, you have to provide the relative path.