Added a fractional anchor.
Documentation improvements; added removeImage method.
Added some more geometry helper functions that are used by other
components.
Factored out the Bayazit polygon decomposer into a separate class.
Added the Douglas-Peucker polygon simplification algorithm.
Modified Polygon to use the top-level Bayazit decomposer and
Douglas-Peucker simplifier.
Improved documentation.
Minor improvements and removal of deprecated code.