Allow the ExponentSummarizer to be subclassed, so that teams can use their own LogSummaryGenerator with it.
Allow the ExponentSummarizer to be subclassed, so that teams can use their own LogSummaryGenerator with it.

git-svn-id: 4739e81c2fe647bfb539b919360e2c658e6121ea@419 716a755e-b13f-cedc-210d-596dafc6fb9b

cerebro/ggp-base,cerebro/ggp-base