#17 Add range check to BitStreamWriter write methods

[Alexander Barthel]

Add range check to write methods in

datascript.runtime.io.BitStreamWriter. Methods:
writeBigInteger(BigInteger, int)
writeByte(int)
writeBytes(String)
writeInt(int)
writeLong(long)
writeShort(int)
writeUnsignedInt(long)

Currently too large values are silently truncated.