Added maven files
Ignore Eclipse files
Added hamcrest and upgrade Junit 4
Added Jmock
When the parachute is opened the lander should decelerate
Mocking classes instead of interfaces
When the lander decelerates, the accelerometer should report its deceleration
Added URL to an example in Ruby
The accelerometer can report acceleration of −50 m/s2
AccelerationObserver is a role
Moved code of mocking classes to an abstract class