function resolveNameEmailPair( pair ) {
	try {
		debug( 'Attempting to resolve name and email: %s.', pair );
		return spawn( RESOLVE_NAME_EMAIL_CMD, [ pair ], {
			'stdio': [ 'pipe', 'pipe', 'ignore' ] // stdin, stdout, stderr
		}).stdout.toString();
	} catch ( err ) {
		debug( 'Encountered an error resolving name and email: %s.', err.message );
		return pair;
	}
}
Resolves a Git user name and email address according to the .mailmap file.

@private
@param {string} pair - name and email pair
@returns {string} canonical name and email address if found, otherwise the original input