Reformatting Advanced Usage to follow Troubleshooting.
Added section for Wi-Fi bridge.
Added section for network bridging.
Merge pull request #58 from anthony-ngu/HardwareSerial_Update

HardwareSerial Release Note about SerialEvent
Merge pull request #59 from zfields/tipWifi

Restructuring of AdvancedUsage.md and addition of internet connectivity options
Adding basic UART Sample