Merge pull request #7 from amitit/develop

Refactoring and Minimap
fixed border offset
absolute measurements read correctly
relative visible measurements calculated
set up dynamic scaling for minimap
fixed frame dimensions
click to focus working
click to focus to center point
click and drag on minimap changes focus
Merge branch 'develop' of github.com:nubo/whiteboard into develop
Merge branch 'develop' into feature/minimap