ds2413: Initial implementation

This adds initial support for the DS2413 Dual Channel Addressable
Switch.  This is a Dallas Semiconductor 1-wire compliant device
providing access to 2 open-drain GPIOs.

https://learn.adafruit.com/adafruit-1-wire-gpio-breakout-ds2413/overview

This driver requires One-Wire over UART support in MRAA (PR #415)
which is not yet merged.

Signed-off-by: Jon Trulson <jtrulson@ics.com>

src/ds2413/pyupm_ds2413.i

@@ -0,0 +1,12 @@
+%module pyupm_ds2413
+%include "../upm.i"
+%include "carrays.i"
+%include "std_string.i"
+
+%feature("autodoc", "3");
+
+%{
+    #include "ds2413.h"
+%}
+%include "ds2413.h"
+%array_class(char, charArray);