Moved Actor class to jenjin-server-world module.
Renamed Round class to Math
Refactoring, added castCircle and castRay methods.
Added location visibility calculation.
Now using much slower, but much more accurate, circle casting algorithm.  castVisibleCircle **should not be used** after world initialization; doing so would result in a huge consumption of time and memory.  Closes #115
Merge pull request #129 from floralvikings/line-of-sight

Line of sight