Add `brew tap homebrew/science` to the Homebrew installation page
fix variable name for consistency
Re-order lines and use unwrap=True
Merge pull request #480 from will-moore/script_sample_gh-470

Script sample gh 470
merge dev_4_4 -D org -I include -E exclude: PR 488 (Add `brew tap homebrew/science` to the Homebrew installation page)
merge dev_4_4 -D org -I include -E exclude: PR 489 (in Java code example fix variable name for consistency)