Changes between 0.1 and 0.2: * Substantial performance improvements, especially for nested atomic blocks. * TSet.View and TMap.View are integrated into the Scala collection class hierarchy, with factory companion objects and Builder and CanBuildFrom instances. * A fix for whileCommitting handlers (issue #3). * TxnLocal can now be read and written from while-preparing and while- committing handlers. Combining TxnLocal and life-cycle handlers is now more concise. * Transaction statistics can be enabled for the default algorithm with the VM argument -Dccstm.stats=1 (details in the ScalaDoc for scala.concurrent.stm.ccstm.CCSTM).