| Fixed issue 106. Added fillStrategy to the toImage method. Not sure if this method will stick around long term in 2.0, since it's doing something that more appropriately belongs in a helper class of some sort, but it works now. Tests have been added aswell. | 
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| core/src/main/java/edu/umd/cs/piccolo/PNode.java | 
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| core/src/test/java/edu/umd/cs/piccolo/PNodeTest.java | 
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