Finished lab
finished
Merge pull request #71 from dinob0t/lab10_dhillan

Lab10 dhillan
update lecture notes
added PCA walkthrough
edited PCA walkthrough
updated lab.
rename lesson14 folder
restore my numpy Lab solutions that got deleted.
added diagnostics & imputation labs
Merge branch 'master' of https://github.com/patwmcnamara/GADS11-NYC-Summer2014