Fix typo and capitalization
Break ReadMe into more sections
No-op: eigen-face => eigenface
No-op: reflow text to 80 characters
Don't put punctuation after closing quotation mark
Top-20 eigenfaces
Explain directory contents
Script to collate eigenfaces into a montage
Eigenface montage
Remove note about visualize_eigenvalues.sh script

We'll bundle all visualization-related information in the visualization
subdirectory of the project.
Move eigenvalue plotter to visualization directory
Eigenvalue graph
Add visualization section with eigenfaces montage