Added some unit tests for new objects.  Updated timezone information to address failed unit tests while maintaining timezone awareness.  The new timezone handling is consistent.  It converts all datetimes to UTC, then strips tzinfo and uses isoformat() to ensure consistent string formatting.
Merge branch 'master' of https://github.com/cleder/czml
Added generic data and load functionality for _CZMLBaseObject
Added new modules to czml/__init__.py.
Added the ability to set doc strings on class_properties
Reverted handling of timezones to the proper functionality.  Date/time values with timezones will fail with the current version of Cesium.  A patch has been submitted as pull request #768 in AnalyticalGraphicsInc/cesium.    https://github.com/AnalyticalGraphicsInc/cesium/pull/768
Merge branch 'master' of https://github.com/cleder/czml
Added several Unit Tests.  Validated they all run.
Merge pull request #3 from Carl4/master

More Unit Tests and better consistency in new object models