Merge pull request #5 from mythodeia/master

Digit drawing & customization
Customization for digits

- New property to enable or disable the digits on the face of the clock.
- New property to customize the offset of the digits to the center of
the clock.
Merge pull request #6 from Boris-Em/pr/5

Customization for digits
Update README.md
Update README.md
Update README.md