Issue #41: Try fix memcache session handle overrun

* Added current_host param to pushEndpoint config entry
* Added "/realstatus/" that does a deeper check and provides more info
* Added rtilder's memcache patch for LRU handles
* Added socket max limit for server (defaults to 1000)
* Moved GenUUID to utils package
* Made memcache timeouts non fatal to app.
* Added memcache status checker
* Memcache handles are now func local
  (Global handle was keeping reapable handles alive.)
* Added file:line to heka error logger.