gnupg2 2.0.20

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
gpg-agent 2.0.20

Closes #20235.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
gnupg2: refresh patch
Move oldest_cpu to Hardware
Decouple bottle tags from MacOS.cat
Add MacOS.pretty_name
sqlite: deps come after options
phantomjs 1.9.1

Closes #20307.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Add class name to method_added error
specialties: point to valid examples
Warn when overriding ScriptFileFormula#install

ScriptFileFormula's use is that it installs whatever was downloaded
to bin; if the install is overridden, there's no benefit over deriving
directly from Formula.
ack: use Formula
cloc: use Formula
ttytter: use Formula