Fix spelling
Update to current usage. Refactor to includes.
Using right redirects for 5 downloads
Merge pull request #670 from hflynn/downloads_5

Using right redirects for 5 downloads
Revise basic usage and examples.
merge dev_5_0 -D org -I include -E exclude: PR 666 (what's new for 5.0 updates)
merge dev_5_0 -D org -I include -E exclude: PR 667 (Add details for omero_home usage)
merge dev_5_0 -D org -I include -E exclude: PR 669 (Update cli-import page)