Update README.md

Clean up readme and add link to Releases page
Update README.md

Update readme wording
Merge branch 'release-1.4.0'
Merge branch 'hotfix-1.4.1'
Update vboxmanage to VBoxManage to fix case-sensitive file-system issue
fixes #6
bump to version 1.4.2
Merge branch 'hotfix-1.4.2' into develop