* Added Hole class
* Replaced references to "Circle" with "Hole"
* Enhanced bridge random generation to take into account clipped circles
* Added bridge rendering
* Fixed the rendering of the bridges
* Fixed the bridge generation for cropped circles
* Changed Hole class attributes
* Added advanceBridge method in Hole.java
* Added a Polygon attribute to the Hole class
* Overrode the "contains" method in the Hole class
* Added a Key class
* Fixed the bridge generation for cropped circles (again)
* Managed and rendered the keys
Merge pull request #12 from newfelMessouci/Hole-Bridge-Key

Hole bridge key