Add chapter 10
Chapter 10 outline
Deleted 10-databases.md
Chapter 10 updates
Updated 10-storing-data.md
Updated 10-storing-data.md
Updated 10-storing-data.md
Updated 10-storing-data.md
Some database stuff.
Alembic.
Wrap up chapter 10.
Merge pull request #31 from rpicard/ch-10

Ch 10