Sample demos

## Caution: this pr is not ready yet for merge

Demo 2 is in folder called drone_delivery, to run it you have to change the variable named ROOT_PATH to the absolute where this example lives, i left my path in there as an example, and yes! you need to either run this through mavproxy or sitl

**Mavproxy**
```
mavproxy.py --master=/dev/ttyUSB0,115200 --cmd="api start drone_delivery.py"
```

**SITL** ( I added this to my **~/.mavinit.scr**)
```
module load droneapi.module.api
api start /home/user/Droneapi/drone_delivery.py
```