STM32F4 Discovery, SPI and microSD

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roy.emmerich
Just to properly complete this ticket I thought I would add some scope images of what things look like when everything is working.

Read
```
>var f = require("fs").readFile("test.txt");
="hello\n\n"
```
produces:

Write
```
>var f = require("fs").writeFile("blah.txt","hello");
=true
```
produces:

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