update
rm files
update
update
update
update
publish Session1
Merge branch 'develop'

Conflicts:
	notebooks/Session-1.ipynb
update
Merge branch 'develop'

Conflicts:
	notebooks/Session-2.ipynb
	notebooks/prepare.ipynb
bug fix
Merge branch 'develop'
update
update Session 4
Merge branch 'develop'

Conflicts:
	notebooks/prepare.ipynb
update