Refactored demo8.jsp. Uploaded new sample presentatios for demo8.jsp

bbb-api-demo/src/main/webapp/demo2.jsp

bbb-api-demo/src/main/webapp/demo8.jsp

bbb-api-demo/src/main/webapp/pdfs/Demo123.pdf

bbb-api-demo/src/main/webapp/pdfs/Demo456.pdf

bbb-api-demo/src/main/webapp/pdfs/Demo789.pdf

bbb-api-demo/src/main/webapp/pdfs/presentation1.pdf

bbb-api-demo/src/main/webapp/pdfs/presentation2.pdf

bbb-api-demo/src/main/webapp/pdfs/presentation3.pdf

bbb-api-demo/src/main/webapp/pdfs/sample.pdf