Remove transparent flipping / always leave proper flipping to the use…

…r, 4.0.0

Rebuild for NPM incl. fix for protobufjs#46

Resolve ReferenceError in BBNB#toBuffer(true), fixes protobufjs#35

Simplify CommonJS conditions, see protobufjs#34

Fix toArrayBuffer offsets on slow path

Fix relative offset advance in writeUTF8String

Improve CommonJS compatibility

Remove optional dependency node-memcpy and make it an optional instal…

…l step

Also optimize encodings, use lxiv for base64

Optimize string writing, too