Add support for Arduino Zero

[ryanfobel]

Add the following to the platformio.ini file:

[env:zero]
platform = atmelsam
framework = arduino
board = zero 
build_flags = !python build_flags.py

The build fails with the following error related to not finding an EEPROM.h file:

[11/30/17 09:37:34] Processing zero (platform: atmelsam, build_flags: !python build
_flags.py, board: zero, framework: arduino)
----------------------------------------------------------------------------------
PlatformManager: Installing atmelsam
Downloading  [####################################]  100%
Unpacking  [####################################]  100%
atmelsam @ 2.7.1 has been successfully installed!
The platform 'atmelsam' has been successfully installed!
The rest of packages will be installed automatically depending on your build enviro
nment.
PackageManager: Installing framework-arduinosam @ ~2.10616.1
Downloading  [####################################]  100%
Unpacking  [####################################]  100%
Verbose mode can be enabled via `-v, --verbose` option
Converting base_node_rpc.ino
Collected 32 compatible libraries
Looking for dependencies...
Library Dependency Graph
|-- <CArrayDefs>
|-- <SPI> v1.0
|-- <Wire> v1.0
|-- <nanopb> v0.3.7
|-- <BaseNodeRpc>
|   |-- <CArrayDefs>
|   |-- <SPI> v1.0
|   |-- <Wire> v1.0
|   |-- <nanopb> v0.3.7
|   |-- <NadaMQ>
|   |   |-- <CArrayDefs>
|   |   |-- <nanopb> v0.3.7
|   |-- <Memory>
|-- <Memory>
|-- <NadaMQ>
|   |-- <CArrayDefs>
|   |-- <nanopb> v0.3.7
|-- <ArduinoRpc> v1.10
|   |-- <CArrayDefs>
|   |-- <NadaMQ>
|   |   |-- <CArrayDefs>
|   |   |-- <nanopb> v0.3.7
Compiling .pioenvs\zero\src\base_node_rpc.ino.o
Compiling .pioenvs\zero\FrameworkArduinoVariant\variant.o
C:/Users/Wheeler/Documents/dev/python/base-node-rpc/src/base_node_rpc.ino:3:20: fat
al error: EEPROM.h: No such file or directory
#include "SPI.h"
^
compilation terminated.
Compiling .pioenvs\zero\FrameworkArduino\IPAddress.o
*** [.pioenvs\zero\src\base_node_rpc.ino.o] Error 1
Compiling .pioenvs\zero\FrameworkArduino\Print.o

[ryanfobel]

We can use this FlashStorage library to emulate the EEPROM functionality.