Merge pull request #21 from captnTardigrade/patch-1

fix beta hat expression

Rename LICENSE to LICENSE.md

Create LICENSE

Delete treecode.ipynb

Delete boosting-Copy2.ipynb

Delete boosting-Copy1.ipynb

Delete TODOs.md

Delete .DS_Store

Delete Untitled-checkpoint.ipynb

update math appendix

fix typo on conventions

copy from offline

Merge branch 'master' of https://github.com/dafriedman97/mlbook

update README