Merge pull request #1 from aybabtme/build

Add simple bash build script.
Don't want to track the build jar
Moved circle to its own class
Changed x/y to cx/cy: they are now the center of the circle, circle is correctly centered, set dimensions on canvas not frame, made methods synchro
Removed a debug statement
Changed Circle to PulsatingCircle
Removed lines
Don't need Graphics2D
Change build script to Ant. run.sh cleans up.

The build.sh script was crap.  The Ant script is better and more
flexible.

The run.sh script is moved to the root of the project and:

* Compiles.
* Run the jar
* Clean up.

In this order.