Alpha 1     -  Initial release
Alpha 2     -  Many code cleanups 
            -  Attempting to assign to a non-option attribute on Chart classes
               now raises AttributeError. This prevents errors like accidental
               mistyping of option attributes from going unnoticed.
            -  setData now accepts None values to indicate missing data. 
            -  .draw methods now accept either a string filename, or a file
               pointer.
            -  .setLabels now takes a single list as argument. The previous
               calling convention was found to be too confusing by some people.
            -  .getAllOptions now inlcudes the "with" and "height" options.
            -  Rename 3d* options to threeD*. Python properties can't start
               with a digit.
Beta		-  Fix a type bug that stopped TrueType fonts from working (thanks to Amit J. Patel) 
			-  Fix a bug that manifested itself when setting some options to "None" (thanks to Perry Tew)