Cleaned up code and allowed for globally-shared ZMQ context for efficiency
Added new Chrome-user-agent-based google_web engine
* Module based on combining AJAX requests from Google's
  latest page (Nov 2013)
* Old IE-user-agent-based method no longer works
  renamed broken module to GoogleOldWebSearch
Added unit tests for new google_web search module
fixed id parsing
Small bugfixes
Updates for release