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/
Do we have a minions/ supported today? My next PR should have HTML page for APIServer ready, which have a list of minions and other info with proper hrefs. In this case, I think the confusion should be minimized. I am pretty open on this, and could change it if you feel strongly about it.