Upgrade to MongoDB 2.6.0

- All unit test passed but still running Mongo Java Driver 2.11.4
Upgrade to MongoDB 2.6.1

- All unit tests pass
Upgrade to MongoDB 2.6.0

- All unit test passed but still running Mongo Java Driver 2.11.4
Upgrade to MongoDB 2.6.1

- All unit tests pass
Remove unused class OplogProcessor
Try to set more sensible log levels, and other log message tweaks
Merge branch 'remove-unused-class'
Merge branch 'logging-level-tweaks'
Upgrade to MongoDB 2.6.0

- All unit test passed but still running Mongo Java Driver 2.11.4
Upgrade to MongoDB 2.6.1

- All unit tests pass
Test whether the river handles TokuMX oplog refs properly
Handle TokuMX oplog refs
Don't print full contents of large objects to logs, in Slurper
Merge branch 'tokumx-refs'
Merge branch 'tokumx-compatibility'
Merge branch 'tokumx-compatibility'
Slurper: fix NPE when flattenOps leaves op and ns undefined
Slurper: specify strict JSON serializer for entry in several log messages
Slurper: promote messages logged before aborting the Slurper loop from warnings to errors
Update the URL for the TokuMX download page to keep the tests working