reorganized files
constructed code
Fixed some typos in the project description text
Some minor text edits to the project 5 description
Convert tabs to spaces

Also better comments to explain python operators
Make the script executable
Document assumptions
Use xrange to be more efficient
Merge branch 'jessica/project4' of https://github.com/jessicabartley/computational-physics into jessica/project4
Revised code for general n dimensions.  Plotted up results.
The old code calculated an estimate for pi.  This new code calculates an estimate for the volume of the N sphere.  This old code and its associated documentation was saved in a file called "oldcode" and the new code and its updated documentation occurs in this update.
Some minor edits to the project description text and the stat of a code for project 5
worked more on the project 5 code