Update PHPCS config

See #231
Add a function to verify an nonce

WordPress has a function to verify an nonce, however, it is pluggable
and so can’t be relied upon to perform proper sanitization. There is no
real precedent for the best way to sanitize an nonce, so we’ve
introduced this function so that all nonce sanitization will be done in
just one place. That way, if it needs to be modified in the future,
we’ll be all set.

Includes unit tests.

For PHPCS, and early sanitization, with love.

See #231 as an excuse.
Appease the JSHint dragon

See #231
PHPCS fixes

See #231
Update l10n validator

See #231
Update PHPCS config

Again. Silences some things temporarily.

See #231
PHPCS fixes

See #231