Fixed hygiene bug in witness generation.
Merge pull request #232 from travisbrown/witness-hygiene

Fixed hygiene bug in witness generation.
ToTraversable[HNil, M[_], T] with T not Nothing
ToSized[HNil, M[_], T] with T not Nothing
Merge pull request #235 from alexarchambault/totraversablehnilfix

ToTraversable[HNil, M[_], T] with T not Nothing
Merge pull request #236 from alexarchambault/tosizedhnilfix

ToSized[HNil, M[_], T] with T not Nothing
Merge branch 'master' into scala-2.10.x