Add the spice of life (variety) to responsetime text.
Copy and test tweaks.

Include "That's" before comparisons.
Only show healthy share of tweets body for replies and retweets.
Output debug copy for headline alternates.
Merge pull request #1983 from cdmoyer/variety-should-be-the-spice-of-response-time

Insight fix: Variety should be the spice of response time