Add Base-64 encoding/decoding to GREL

[tfmorris]

Original author: stefa...@google.com (September 30, 2010 15:41:25)

Would be nice to be able to perform base64 encoding/decoding directly in GREL

Original issue: http://code.google.com/p/google-refine/issues/detail?id=148

[tfmorris]

Rather than implementing this as it's own function, it might be a good idea to introduce a pair of encode() / decode() functions which take an algorithm as an argument. e.g. "foo".encode("base64")

[thadguidry]

@tfmorris Totally agree. I can envision how that proposed pair of encode() / decode() functions would be similar in syntax with how we did the escape() / unescape functions.