Readded support for Arduino ADK, Leonardo etc.
Merge branch 'xxxajk' of github.com:felis/USB_Host_Shield_2.0 into xxxajk
Merge branch 'xxxajk' of github.com:felis/USB_Host_Shield_2.0 into xxxajk
Merge pull request #45 from felis/xxxajk

Readded support for Arduino ADK, Leonardo etc.