Move tests into com.jenjinstudios
Changed castCircle to return List instead of LinkedList
Moved castCircle to MathUtil
Moved Vector2DTest to jenjin-world-core
Renamed test
Added MathUtilTest
Added constructor to MathUtil which immediately throws an exception, to be tested for code coverage.

Added tests for the rest of MathUtil.
Added more tests for Vector2D.  com.jenjinstudios.world.math now has 100% coverage.
Removed vestigial "step" parameters from messages.
Removed vestigial "step" parameters from messages.