Change app name / usage in README file
Re-space some paragraphs

Yes, I'm really this OCD... but vim at least makes this a 30-second task
Put more info in docs; reword confusing statements
Update app name in README for verifyJP2s
Fix comments in verifyJP2s

Removes mention of "Brikker" since that's no longer the app name, and
rewords the comment to explain doVerify's purpose better
Merge branch 'feature/fix-docs'