Provide ImageMagickThumbnail solution

Prior version resides in
https://github.com/Georgetown-University-Libraries/DSpaceImageMagickThumnails

Conflicts:
	dspace-api/pom.xml
Adding license per travis build errors
Adding dspace.cfg for LIT media filter
Merge pull request #4 from LongsightGroup/lit-media-filter

Use Terry's LITImageMagick PDF thumbnail media filter