Small footprint flash#1

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henkmuller wants to merge 13 commits intoxcore:masterfrom

henkmuller:master

Commits on Jul 6, 2012

Working small flash library - universal read and write at sinle speed to single device
henkmuller
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Commits on Jul 9, 2012

Commits on Jul 10, 2012

New app for testing, repaired lack of spi_conf.h inclusion in build system
henkmuller
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More documentation, added speed to configuration
henkmuller
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