tag v0.2 with superchannel support

1. 90bd7b6 hdlc: add call-back function for completely decoded HDLC frames by Harald Welte · 8 years ago
2. 6daa71d hdlc: Simplify + Fix HDLC implementation by Harald Welte · 8 years ago
3. 90fb785 hdlc: Add some more comments to the code [cosmetic] by Harald Welte · 8 years ago
4. d83c513 WIP: More work on SuperChannel decode, but it doesn't work yet... by Harald Welte · 8 years ago