[Spektrum] Configure the bind pin to be pullup/pulldown.

All Lisa/M and Lisa/MX prior to V2.1 don't have a dedicated pull
resistor on the bind pin. We were configuring the pin as floating input.
This will result in random behaviour, depending on the charge of the
GPIO. The system will decide to set the satellites into bind mode
depending on how much moist finger is present on the pin. We want
something more decisive than that. :)
Merge pull request #814 from esden/spektrum_bind_pin_fix

[Spektrum] Configure the bind pin to be pullup/pulldown.
[module] module to control a HackHD digital camera
[ins][invariant] fix mag orientation and add support for rotorcrafts
[boards] Added Lisa/M and Lisa/MX V2.1.

The only major change to v2.0 related to software is the fact that
we have a dedicated Bind button now and are not misusing the ADC1 pin
any more. Otherwise the changes are mostly mechanical including the
integration of Aspirin V2.2 into the board design.

closes #813
[conf] update wiki urls