Added readFile.js

This is the initial iteration of the javascript. It reads a simple ASCII
file and calls the DBSCAN function, passing an array of points derived
from the file. It is not yet PBM complete.
Added the other project files.

I added the DBSCAN script contained within the index.html, which drives
the program. I also added the constructor for the Point object.
Added example PBM.
Added validation for file selection and .remove

.remove method by John Resig (MIT Licensed) added to simplify what I'm
about to do next.
Implemented PBM parsing. change dbscan signature

I reworked the readFile.js code to properly handle and parse .pbm (P1,
ASCII) images. I also changed the signature of the DBScan function to
include width and height parameters, passed in from readFile.js
(originating in the size declarations in the .pbm file.)