Issue6: expressional clock face
Initial commit. add feature description to changelog.
 Issue6: expressional clock face
New state property was added into ClockFace. This value is applied as class to main time element. So now it is possible specify styles for each state. It is possible to set any state you want.
Merge pull request #10 from denis-vilyuzhanin/dev_issue6

[dev_issue6->dev] Issue6: expressional clock face