Finished homework 2
Faster version of homework2

Added .gitignore to ignore temporary files.
Removed octave-core and removed all methods

Made GDATrain as fast as I could by removing
all functions and calculating all matrices and
indexes only once.
Moved faces.mat outside and plot to file

Uses now same faces.mat for both homeworks. Resulting plots
from homework 2 are now as well ploted to a file.
Removed temp file