v1.0.2 - Fix AXI protocol violation & remove read data interleaving

Fix #19 and remove read data interleaving

The fix consists of the round-robin update:

• the core now keep last the granted master index
• the en control in slave and master switch have been updated

Both the changes make the core AXI4 compliant for address channel (more details in #19)

Read data channel with this change doesn't interleave anymore data when completion packets use different IDs.