Add Richard Rodger's MediaFilter Curation Task
Configure large image thumbnail, and high quality scaling
CurationTask to generate image thumbnail of PDF

Works from the UI
Merge branch 'longsight-4_x' of https://github.com/LongsightGroup/DSpace into longsight-4_x
New Mirage2 theme for WashingtonLee
Customize WashLee WLU mirage2 theme