Revert "Implement TimedRotationPolicy"

This reverts commit be5eae3bcc07cfbaf49c19c57da42dac1351a3e3.
Revert "implement locking for file writes/rotation"

This reverts commit f227830fdbe14290c6870835b3aab6f701dbdddb.
Revert "mark instance variables initialized in prepare() as transient"

This reverts commit 3509e241dfdb9c91de5dae382218b95bb002e814.
Revert "changed hdfs security config keys to hdfs.*"

This reverts commit ed3d42d1afa2759b667dff3e4bd77d2dce79805e.
Revert "remove unnecessary call to hsync() when closing files"

This reverts commit 1154884438cae5eeb26c4213f8ad80c640bebdff.
Revert "ack tuple after conditional push to disk"

This reverts commit 3f22fc697c473d6d88a48b631dd0956c96f94f82.
Revert "mark prepare() method as final"

This reverts commit 20be88f5dae7af8bd4a749731ee8a6890c249942.
Revert "fix typo in README"

This reverts commit 23a63756ac52a0a34309b72918e8b63b2d622e78.
Make HdfsBolt more amenable to subclassing