Add apache libraries

Need apache-cassandra so we can use the ByteBuffer utils. Need the
extra libraries because they are loaded by the ByteBufferUtil.

*Note:* In production the comparator will be able to load these because
cassandra will be running, only needed for testing / dev.
bug fixes to pass tests

* use the reverseResult() function
* refactor DatumType.directCompare() to match the logic layout of
 regexCompare
* bug in DatumUtil.advanceToLongIfPresent() it was advancing beyond the start
of the digits.
* modify DatumUtil.advanceToLongIfPresent() to test for trailing non digits