#331: Update Development Section
#331: Readjust linkable text to download VirtualBox
#331: Readjust linkable text to download Ubuntu
#331: Fix linkable text to VirtualBox
#331: Fix linkable texts
#331: change 'https://' to 'http://'
Merge pull request #332 from jeff1evesque/doc_development_section

#331: Documentation - Update Development Section