Title: SPI flash read and write

Description:

A simple spi flash example using the microkernel.

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Building and Running Project:

This microkernel project outputs to the console.  It can be built and executed
on arduino_101 as follows:

    make BOARD=arduino_101

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Troubleshooting:

Problems caused by out-dated project information can be addressed by
issuing one of the following commands then rebuilding the project:

    make clean          # discard results of previous builds
                        # but keep existing configuration info
or
    make pristine       # discard results of previous builds
                        # and restore pre-defined configuration info

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Sample Output:

SPI flash testing!
data sent ..
data received ...