Ignore more.
Merge pull request #123 from PX4/#106-px4io-relays

Initial implementation of application access to the PX4IO relays.
Merge branch 'master' into #111-px4io-integrated-mixing

Fix a botched merge for #106 at the same time.
Merge pull request #132 from PX4/#111-px4io-integrated-mixing

#111 px4io integrated mixing
merged relay changes from master