pil: fix download

Closes #20818.
uses: fail fast if invalid formula names are given

Fixes #20819.
Formula.each: note why import failed

Refs #20819.
Detect Command Line Tools on Mavericks.

Closes #20774.
brew-test-bot: force fetching formulae.

References #20807.
ARGV: filter build-bottle from dependencies.

Fixes #20682.
brew-test-bot: don't install dependencies first.

Now that --build-bottle is filtered we don't need to worry about extra
installation time.
Reword uses comment
couchdb: generate our own plist.
couchdb 1.3.1

Closes #20801.
brew-test-bot: remove prefix from email subject.
brew-test-bot: fix email subject filename.