Preliminary GPS support
Reduce time suggested for animating flip in readme

Avoid unexpected double flips
Missing comma
Merge pull request #67 from andrew/readme-tweak

Reduce time suggested for animating flip in readme
Merge pull request #68 from andrew/gps

Preliminary GPS support
Fixed errors in GPS data definitions.

* Fixed incorrect order of unk0 & data_available fields.
* Fixed misspellings.
* Many fields are actually arrays (this was causing a lot of fields to
have nonsense values).

Based on https://github.com/paparazzi/paparazzi/blob/55e3d9d79119f81ed0b11a59487280becf13cf40/sw/airborne/boards/ardrone/at_com.h
Merge pull request #71 from wiseman/fix_num_sats

Fixed errors in GPS data definitions.
Fixed test-parseNavdata tests (issue #72).

* Removed the failing zimmu3000 option test--I think it's been obsoleted
by GPS.

* Fixed up test/fixtures/navdata.bin by replacing what looked like a bogus GPS
option with a real one, recorded from firmware 2.4.7 (and updated the checksum
of the entire data packet).
Added unit tests for gps option.

Not all values look legit to me--longitude, hdop and vdop look suspicious.

I changed droneTimeToMilliseconds so it won't return negative times and
fixed gps.last_frame_timestamp to be in milliseconds.
Merge pull request #73 from wiseman/fix_tests

Fixed parse-Navdata tests and added tests for gps.
0.2.1
Added handling of ACK for config commands.

We now have two classes of commands: blocking and non-blocking.
`CONFIG` is blocking, all others are non-blocking.  When a blocking
command is sent, no other blocking commands will be sent until an ACK
is received (and cleared) from the AR.Drone.
Fixed missing var.
Added unit tests for CONFIG ACKs.
fixed typo
Merge pull request #77 from janpieper/fix-small-typo-in-readme

Typo in README
Changed signature of config.

config can now be called as config(key, value, callback) or config(options).

Added more info on config to README.
Fixed config signature to bring callback out of options.
Increased default timeout to 500 ms.

Also removed vestigal retries references.
Increased delay in test to trigger timeout.