Add atlas manager to CircleOptions
Use atlas manager for circle style
Fix @type annotation

A description for @type annotation emits a warning.
Add example for symbols in an atlas
Implement `getChecksum` for RegularShape
Add atlas manager to RegularShapeOptions
Integrate atlas manager into RegularShape
Add regular shape example
Add stars to example
Merge pull request #33 from tsauerwein/webgl-point-symbol-atlas

[webgl-point] Use the atlas manager for symbols [WIP]