Merge pull request #9 from apetri/master

Explicit python implementation of EM algorithm
Add notebook
more updates
finish up presentation
Merge pull request #10 from weaverba137/master

Chapter 5 Presentation
dding summary of section 5.1 presentation by hogg
Add notes after discussion
Merge pull request #11 from weaverba137/master

Adding some notes to the Chapter 5 presentation
modified fed's hack to wise colors
adding Section 5.8 and demos
Merge pull request #12 from dfm/master

Adding Section 5.8 and demos
added another example
seed
added data to repo
figures, whatever
Merge branch 'master' of https://github.com/adrn/NYCastroML
adding my cross validation notebook
Add mystery data notebook
Uploading my hack
Merge pull request #13 from dfm/master

Cross validation hack