Add the first version of the BASE64 encoding functions
Add the first version of the stream manipulators performing the BASE64 encoding
Add tests for the BASE64 encoding
Add experimental implementations of BASE64 encoding with a testing/benchmarking tool and conclusion
Remove padding_length() from the encoding state; the count of padding characters becomes private
Merge pull request #300 from prantlf/base64_util

Initial version of base64 encoding