Add Poly1305 authenticator algorithm (RFC 7539)

Test vectors are included from RFC 7539.

Poly1305 is also added to the benchmark program.
diff --git a/scripts/generate_errors.pl b/scripts/generate_errors.pl
index 36ee60b..1dac39b 100755
--- a/scripts/generate_errors.pl
+++ b/scripts/generate_errors.pl
@@ -32,7 +32,7 @@
 my @low_level_modules = qw( AES ARC4 ASN1 BASE64 BIGNUM BLOWFISH
                             CAMELLIA CCM CHACHA20 CMAC CTR_DRBG DES
                             ENTROPY GCM HMAC_DRBG MD2 MD4 MD5
-                            NET OID PADLOCK PBKDF2 RIPEMD160
+                            NET OID PADLOCK PBKDF2 POLY1305 RIPEMD160
                             SHA1 SHA256 SHA512 THREADING XTEA );
 my @high_level_modules = qw( CIPHER DHM ECP MD
                              PEM PK PKCS12 PKCS5