Allow direct encryption of binary blobs

[seaeagle1]

I've introduced en- and decrypt functions without the string conversions and/or base64 encoding to allow encoding of binary data. Perhaps they are useful for someone else as well.

[JasonPierce]

@seaeagle1 this is looking good. let me pull it down and take it for a spin, and find out why Travis-CI isn't passing

[JasonPierce]

Travis-CI fixed, and build passing. Just need to find some time to pull it down now. Thanks for your patience