rosie: installation guide update and some tidy up.

A result of multiple feedbacks by @hjoliver.
Merge branch 'master' into rosie-tidy
Merge branch 'master' into rosie-tidy
Merge branch 'master' into rosie-tidy
Fix typos and more rose.conf examples.
Merge pull request #707 from matthewrmshin/rosie-tidy

rosie: installation guide update and some tidy up.
Merge branch 'master' of github.com:metomi/rose into gh-pages