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...DateTime class. * Added a framework for performance monitoring during development. - New performance directory with subdirs for code to be monitored for performance (subjects) - New script files: script/benchmark_subject runs a ruby benchmark on one performance subject script/profile_subject runs ruby-prof for a subject and puts a kcachegrind compatible calltree in the performance_data directory. - New rake tasks: performance:benchmark runs benchmarks against all subjects in the performance directory and produces a consolidated output file in performance_data/benchmarks.out...