#56: Support basic preservation of CZML visual fidelity. This has the following caveats:

 - Points: Only point size and color is preserved. All other settings ignored.
 - Lines: Only line color is preserved. All other settings ignored.
 - Polygons: Only line and fill color is preserved. All other settings ignored.
 - Themes: Only rules with filters defined are preserved. Rules without filters (ie. The default rule) will be ignored because we lack the ability to check if a given rule filter matches in a feature reader.
 - Scale Ranges: Only the first scale range (and styles/rules within) is considered

This gives us some semblance of basic visual preservation for points/lines/areas
Merge branch 'master' of https://github.com/jumpinjackie/mapguide-rest