Merge pull request multiformats#11 from kevina/master

Distinguish between encoding with and without padding, add z-base-32.

multibase.csv

@@ -2,11 +2,16 @@ encoding,     code, name
 base1,        1,    unary tends to be 11111
 base2,        0,    binary has 1 and 0
 base8,        7,    highest char in octal
-base10,        9,    highest char in decimal
+base10,       9,    highest char in decimal
 base16,       Ff,   highest char in hex
-base32,       Uu,   rfc4648 - highest letter
-base32hex,    Vv,   rfc4648 - highest char
-base58flickr, Z,    highest char
-base58btc,    z,    highest char
-base64,       y,    rfc4648 highest char
-base64url,    Y,    rfc4648 highest char
+base32hex,    Vv,   rfc4648 no padding - highest char
+base32hexpad, Tt,   rfc4648 with padding
+base32,       Bb,   rfc4648 no padding
+base32pad,    Cc,   rfc4648 with padding
+base32z       h,    z-base-32 - used by Tahoe-LAFS - highest letter
+base58flickr, Z,    highest letter
+base58btc,    z,    highest letter
+base64,       m,    rfc4648 no padding
+base64pad,    M,    rfc4648 with padding - MIME encoding
+base64url,    u,    rfc4648 no padding
+base64urlpad, U,    rfc4648 with padding