Added libb64-1.2.1 for base64 encoding/decoding

external/libb64-1.2.1/CHANGELOG

@@ -0,0 +1,33 @@
+libb64: Base64 Encoding/Decoding Routines
+======================================
+
+## Changelog ##
+
+Version 1.2.1 Release
+---------------------
+Fixed a long-standing bug in src/cdecode.c where value_in was not correctly
+checked against the bounds [0..decoding_size)
+Thanks to both Mario Rugiero and Shlok Datye for pointing this out.
+Added some simple example code to answer some of the most common misconceptions
+people have about the library usage.
+
+Version 1.2 Release
+-------------------
+Removed the b64dec, b64enc, encoder and decoder programs in favour of
+a better example, called base64, which encodes and decodes 
+depending on its arguments.
+
+Created a solution for Microsoft Visual Studio C++ Express 2010
+edition, which simply builds the base64 example as a console application.
+
+Version 1.1 Release
+-------------------
+Modified encode.h to (correctly) read from the iostream argument,
+instead of std::cin.
+Thanks to Peter K. Lee for the heads-up.
+
+No API changes.
+
+Version 1.0 Release
+-------------------
+The current content is the changeset.