support turning on and off usb stick recording
add documentation
Merge pull request #53 from sameerparekh/dev-unstable

Turn on and off USB stick recording
Motor PWM added to Navdata. README updated.
Minor readme edits
Migration to Catkin build system

- deleted manifest.xml
- updated CMakeLists.txt
- created package.xml

This patch shuold be tested. It's also neeed to change the e-mail in package.xml, it was choosen a random e-mail to make the package compile with catkin
allow multiple drones to be controlled