Updating environment

Returning sensors as scipy array
Checking abs value of x_position
Removing extraneous self.thrust and self.burn
Adjusting senors limits and rewards; defining performAction
Checking abs value of x_position
Adding fitness calculations from HillClimber
Fixing task environment passing; returning reward only at end

This effectively disables the notion of a cumulative reward.
For this system we only want a reward based on the final state after
isFinished() returns true
Removed superfluous definition of performAction

It's already in the superclass, so it doesn't need to be redefined
especially considering it was calling the superclass's action... my bad
Updating environment code
Adding notes
Woops, fixing thrust
Adding dynamic reward system
Updating main
Fixing environment