previewer: Mozilla pdf.js viewer component
- Adds pdfjs viewer component from Mozilla pdf.js as a single commit. This commit is needed since the viewer part of pdf.js cannot be installed via bower.
- NOTE: All source code in commit is copyrighted by Mozilla Foundation and licensed under Apache License Version 2.0.
Reviewed-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
Signed-off-by: Adrian Pawel Baran <adrian.pawel.baran@cern.ch>