Merge pull request #374 from kennethgillen/vdi_url

URL of Virtual Appliance changed to release downloads page, instead of Daily Builds.
merge dev_4_4 -D org -I include -E exclude: PR 346 (Training update april 13 1)
merge dev_4_4 -D org -I include -E exclude: PR 361 (Further corrections to troubleshooting)
merge dev_4_4 -D org -I include -E exclude: PR 368 (Cpp: Correct content and markup)