Adding DAM Watermark process documentation
added thumbnail, changed the config in the main page to remove an extraneous jcr:content, and updated the 3rd image showing configuration
Changed thumbnail image
Added more explicit documentation and future options to the watermark section.
Added Senthil's Matte process stuff.
Merge branch 'watermark-gh-pages' of github.com:bschuhma/acs-aem-commons into bschuhma-watermark-gh-pages
moving dam workflow to older position; reformatting to use numbered lists for step-by-step instructions; clarifying the purpose of the matte rendition process; resizing overly large images