Chenged LED_PIN for Melzi boards, added comment about broken versions of the Sanguino libraries
Fixed typo in comment
Extended comment explaining M42 usage
Revert "Extended comment explaining M42 usage"

This reverts commit 01541ee64ca1239c9bfa593c54085ae78e0b78ec.
Added comment about M42 usage (clean)
Merge pull request #371 from Banjer/Melzi_LED_PIN

Chenged LED_PIN for Melzi boards, added comment about broken versions of...