Update README documentation.
Fix InMemoryLog.removeAfter.
Remove log size assertions from LogTest since size is measured in bytes.
Merge pull request #10 from kuujo/memory-log

Fix InMemoryLog.removeAfter.
Added concurrentunit to perform assertions from callback threads.
Broke test structure into separate unit and functional groups.
Moved memory mapped log file output to target/logs so it gets cleaned by builds.