Merge pull request #79 from johnkabler/master

cross validation homework
switch order of arguments
n-fold cross validation implementation
add naive bayes code study for kevin
Merge pull request #80 from justmarkham/master

add naive bayes code study for kevin
add holly bayes from ML for hackers and prelim project overview
questionable attempt at KNN and beginning of naieve bayes code study
Merge pull request #81 from dblosqrl/master

add holly bayes from ML for hackers and prelim project overview
Merge pull request #82 from lauralorenz/master

questionable attempt at KNN and beginning of naieve bayes code study
adding elevator pitch
fix links
starter for 07-linear
Merge pull request #83 from pgrimm52/master

Adding elevator pitch homework
jess project pitch
Merge pull request #84 from JessicaGarson/master

jess project pitch
add starter for linreg assign
better alignment
23andMe
Merge pull request #85 from JessicaGarson/master

23andMe
Add Dave's elevator pitch.