Revert "Added I2C slave echo example in examples folder. Using another maple, write a byte and then read."

This reverts commit 594724951553a882758c11497a4f03828b4f43e6.

Reverting pull request #54, which breaks examples/i2c-mcp4725-dac.cpp.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Revert "I2C slave support cleanups."

This reverts commit 39cd07a640ee87b7937738d36f17019b2865bfae.

Reverting pull request #54, which breaks examples/i2c-mcp4725-dac.cpp.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Revert "- tx and rx callbacks for each module"

This reverts commit da01c80f24dc9c43ff951ea9fd283abb4628ceb7.

Reverting pull request #54, which breaks examples/i2c-mcp4725-dac.cpp.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Merge branch 'revert-pull-54'