Add examples
new file:   ch04/ch04x05/BitLogic.java
new file:   ch04/ch04x06/ByteShift.java
new file:   ch04/ch04x07/MultByTwo.java
new file:   ch04/ch04x08/HexByte.java
new file:   ch04/ch04x09/ByteUShift.java
new file:   ch04/ch04x10/OpBitEquals.java
new file:   ch04/ch04x11/BoolLogic.java
new file:   ch04/ch04x12/Ternary.java