Updated merkyl to 1.0.2

Merkyl needed to be upgraded due to a fault in the raw get() method used
in the tracker.
Fixed bug in artifactor fixture

Artifactor was never telling merkyl to cleanup as the artifactor server
was being shutdown before the 'merkyl_teardown' event was being fired.
Added new merkyl fixture

Request to be able to add log files to merkyl on the fly and then
retrive and search their contents. To do this the following was
implemented.
* Added MerkylInspector class with the following methods
 * add_log() - adds a log file to the current merkyl instance
 * get_log() - gets the contents of a previously added log
 * search_log() - convenience function doing the get_log() and a simple
   search in one go.
* Added merkyl_inspector fixture which returns a MerkylInspector for the
  current appliance.