Added link to laser scanner node in README
Added some readme to the README
Added link to the wiki
Created robot_pose.py and sensor_model.py
Merge branch 'amlalejini'
Merged my branch with master
Added some comments to sensor model
Implemented occupancy grid class and test file.
Moved files from src directory to nodes directory
Wrote sensor model class, laser scan class, and a probability utilities module.  Sensor model has not been tested, and the laswer scan class is potentially redundant -- we could simply pass around LaserScanMessage objects if we want.
Cleaned up some files
Added a comment to prob util module
Edited sensor_model function to take robot pose angle into account when submitting laser scan angle to ray trace function.
Modified sensor model
Created robot.py module. Contains Robot superclass with abstract sensor and motion model functions. Contains stubs for Turtlebot and Jaguar subclasses that can be filled out with correct functions. Also contains a generic robot subclass that can be passed a sensor and motion model at init.
Merge branches 'brandon' and 'master' into brandon
motion_model sort of done I guess?