* fixed possible bug
* minor update
* renaming ZmqDispatcher -- because it really coupled with CHANEL
* abstracted behavior for channel_dispatcher on how to handle traffic on internal channels
* updated copyright here-and-there
* re-arranged packages
* added LRU support
* added test
* minor code updat
* minor updates in PING
* re-arranged stuff
* minor code update
* minor code update
* minor code update
* minor code update