Pull request for Lecture 14

[BenQLange]

Hi, This is the result of my team's work. I have outlined the changes below:

Akash Singhal: Additional Information and Reading Material Section Sherry Li: EKF SLAM with unknown correspondences Colin Shi: Summary of different approaches of SLAM Bernard Lange: ROS packages that provide SLAM implementations William Davi Brannon Jr: Overview list of what was to be learned in the intro section. Paul Planeix: Element to introduction and conclusion Daniel C Lee, Josiah Okeakuakouikaika Marshall Clark didn't respond to emails.

I tried to make it as clean as possible. If there's something I need to change, please email me.

Thanks and sorry for the late submission.