Fix long descriptions of `benchmark` and `serve` commands
Minor copyediting, no new content added.
Typo fix: "simple" → "simply" in templates/views.md

Thanks to @paulsullivan for catching that typo!
Revise README.md: buildDate expects timezone; copyediting

Since commit 3a8c12418a97230df714488e522f44ce8af685c5 dated 2014-12-09,
commands.buildDate expects `date +%FT%T%z` rather than `date +%FT%T`.
Update README.md accordingly.

Also did a little copyediting.