Fix bad JSON
Merge pull request #6 from weaverba137/master

Fix bad JSON
added chapter 2
Merge branch 'master' of github.com:adrn/NYCastroML
remove old nb
updated to new version from fed
Section 2.5 added
Merge branch 'master' of https://github.com/adrn/NYCastroML
Section 2.1-4 notebook
remove empty file