First try to adapt algorithm 9.2 to work on several dimensions

mvnpdf (phi, zeros(D+1,1), var_prior*eye(D+1)) in fit_logr_cost gives an
0 for high dimensions causing the log to go to infinity.
Added regression example 9.8, moved code into folders
Regression code now works is multidimensional, improved code speed

Using sparse matrices decreased code execution time from 20s to 4s
Optimizations on mclr cost

Used cell2mat for matrix creation and deleted
Small improvement in efficiency by taking the X multiplication out of the loop
Vectorized internal loop of fit_mclr_cost
Fix variable name errata in previous commit
Further speed improvement, hessian update only on outer loop
Moved files to proper folders
Cleaned up commented code
Give data sets their original names

Revert "Renamed data files with simpler names"

This reverts commit 6889bf643e3440612e4832ca8be759af65ee10dd.
Added variables to set on/off profiling and time easily
X multiplication moved in hessian updated
Vectorized even more hessian calculation
Added ~ for unused variable in hessian update
Added bayesian files for classification
Deleted author
Fix name errata
Prior added to the the likelyhood calculation
Prior added to Hessian update