RSSI monitoring on CC3D
List terminator is wrong in some arrays
Merge pull request #165 from ledvinap/fix-pwm_mapping

List terminator is wrong in some arrays
Updating GPS documentation with details on how to enable GPS.
Ensure sensors bitmask contains the flag for the GYRO after gyro has
been detected.
Update RX & Battery OLED pages.
RX page shows up to 14 channels.
Battery page shows current and capacity information.
Show rates on OLED rate display page.
Other minor display cleanups and improvements.
Updating RSSI documentation
Updating Serial.md based on feedback from hwurzburg

See
http://www.multiwii.com/forum/posting.php?mode=quote&f=23&p=58745#pr58745
Adding attomic barrier warning fix and documentation on how to verify
it.  See #167
Some OLED displays do not respond on the first initialisation so refresh
the display when the page changes in the hopes the hardware responds.
This also allows the user to power off/on the display or connect it
while powered.
Formatting
Formatting
Formatting, links added
Added link to Github issue handler
Formatting, links added, added supported buzzer
Added gui image, added exit command and formatting
Links added
Links added
emphasize warning.