remove "===" suffix of base32 encoded secret

[sublee]

Hi Hsiaoming,

I patched OtpAuth.to_google to remove "===" suffix of base32 encoded secret. Because my Google Authenticator failed to read a QRCode when "===" exists.

Please confirm my pull request and update the version.

[lepture]

@sublee Any documentation on Google striped === ?

[lepture]

http://tools.ietf.org/html/rfc3548

                   Table 1: The Base 64 Alphabet

      Value Encoding  Value Encoding  Value Encoding  Value Encoding
          0 A            17 R            34 i            51 z
          1 B            18 S            35 j            52 0
          2 C            19 T            36 k            53 1
          3 D            20 U            37 l            54 2
          4 E            21 V            38 m            55 3
          5 F            22 W            39 n            56 4
          6 G            23 X            40 o            57 5
          7 H            24 Y            41 p            58 6
          8 I            25 Z            42 q            59 7
          9 J            26 a            43 r            60 8
         10 K            27 b            44 s            61 9
         11 L            28 c            45 t            62 +
         12 M            29 d            46 u            63 /
         13 N            30 e            47 v
         14 O            31 f            48 w         (pad) =
         15 P            32 g            49 x
         16 Q            33 h            50 y

I will have a try on Google

[sublee]

No I couldn't find. I'll wait you to test with === in your Google Authenticator.

[lepture]

@sublee Yes, you are right, we need to remove the pad string for Google.

[sublee]

Thanks to test it. Would you accept this pull request?

[lepture]

@sublee 0.1.1 is released.

[sublee]

Cool!