Also remove an application definition from the mangOH Red
sdef for SPI testing since the application is not published.

Remove the .gitignore entires since they are no longer relevant after
switching from repo to submodules.

This app will be presented at the tutorial session at Sierra Wireless
Developer Day 2016.

GPIO 1 has been changed to an input with pullup to match the pullup on
the card itself.

The IoT card eeprom input YAML files have been updated based on review
feedback.
 * number the GPIOs from 1-4 instead of 0-3
 * unused GPIOs are configured as input with pull-up instead of input
   floating
 * vendor name changed to "Talon Communications"
 * serial numbers have been set to an empty string
 * miscellaneous corrections to properties such as card height

Also add sample input files for various existing IoT cards.

The gpioExpanderDemo application was used for basic system testing.
It doesn't belong in the standard mangOH system.

Change-Id: Ib3e3022a29c233940e7d8b2296b5ddd3da52fa56

Change-Id: Ib1b41764a7b194cc4efb6daf673c98d20ed58f9d

Change-Id: I19d1a23f5531e10388e204b70f4ff2ab8f911bf6