Update version to 0.10.0-dev
Update version to 0.10.0-dev

Incl. small changes to how version number is generated.

caktus/django-timepiece,BocuStudio/django-timepiece,arbitrahj/django-timepiece,BocuStudio/django-timepiece,arbitrahj/django-timepiece,BocuStudio/django-timepiece,caktus/django-timepiece,caktus/django-timepiece,arbitrahj/django-timepiece