#95 session/servletContext attribute should be Serializable

[y_masa]

Some application server requires to be Serializable for session or servletContext attribute.
But some classes that can be session or servletContext attribute is NOT Seriailzable.
see http://sourceforge.net/forum/forum.php?thread_id=1649305&forum_id=192228

[Ulf Dittmer]

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I've put up a version of cewolf that fixes this bug (and a few others) at
http://www.ulfdittmer.com/code/cewolf.html.

The fix introduces an incompatibility to previous versions, though:
ChartPostProcessor implementations need to be adapted, but in most cases
the change is an easy one.

[Ulf Dittmer]

Fixed in version 1.1