Add squeakCommon compatibility messages in support of Cryptography port (https://github.com/GsDevKit/Cryptography/issues/1)
a change to SmallInteger>>lowBit for portability to 2.x
fix https://github.com/GsDevKit/zinc/issues/63
move ByteArray class>>readHexFrom: and ByteArray>>readHexFrom: in GsSqueakCommon-Core
Merge branch 'dev'