deleted branch for session13
Regression part II

Covers PCR, Kernel Regression, local-linear regression, and non-linear
regression
Merge remote-tracking branch 'upstream/master'
added 3dhst stuff
here is a file that does some things...
Notebook to calculate intrinsic velocity dispersion
Merge branch 'master' of https://github.com/YastroML/YastroML
Merge pull request #25 from duncandc/master

here is a file that does some things...
Merge pull request #26 from ih64/master

progress in hack
session16 3DHST clustering stuff
Merge branch 'master' of github.com:YastroML/YastroML
Merge pull request #27 from jmbrewer/master

Regression part II
rejecting outliers
s17: gaussian processes & cross-validation
Merge pull request #28 from abonaca/master

added session 17, removed S14/manifolds.ipynb, merged .gitignore changes, modified hack day stuff
Chapter 8 Combined
S17 merged

Merged the two Session17 directories
Merge pull request #29 from mattgiguere/master

S17 Merged
chapter 9 first half

ipnb of first half of chapter 9 of astroML book, covering
classification w Bayes method, k neighbors, and logistic regression