Bumped baud rate to 460800. Added attempt at recovering from buffer overflow.
Communication improvements.  Image transfer improvements.  Demo features.
1. Added command buffer overflow handling.  Pretty much untested.
2. Wait for response for all USART commands, or timeout.
3. Added counters for command buffer overflows and USART command timeouts.
4. Increased baud rate.
5. Add padding characters to Base64 image to ensure Content-length is accurate.
6. Add timers to internal board.
7. Turn on blue LED upon boot, turn it off when DHCP completes.
8. Clear LCD display 10 seconds after boot.
9. Clear LCD 10 seconds after displaying lock command message
10. Issue a beep when image transfer completes