Version 0.5.2 released

Features:

• Added "Last Task" column to the Grunts list. It displays the run time of the last completed task by the grunt. This allows a comparitive indication of performance between grunts.
• Added right-click pop-up menu on Job Queue for 'New job' and 'Remove finished'.
• Loki provides more specific error feedback if blender fails to render an image.
• Removing a finished job does not ask for a confirmation.
• Added 'Remove all finished jobs'.
• Now using the Loki icon.

Fixes:

• The last clicked selection is no longer lost when starting to remove a job, then cancelling.