minor edits based on Vad's feedback
added missing anchor to fix broken internal link
added link to DimensionSpec for alternative way to provide dimensions
expanded and clarified OrderByColumnSpec section
Fix query by segment
* Changed topN queries to use joda Interval instead of string values
* topN by segment now implements BySegmentResultValue<Result<TopNResultValue>> instead of BySegmentResultValue<TopNResultValue>
* Added a unit test which failed uner the prior implementation.
Merge remote-tracking branch 'origin/master' into druid-845
Fix a couple of bugs with retry query runner after testing it locally
add test
change default settings for retry
Add benchmarking for bitmaps

Here are the results on my laptop:

BitmapCreationBenchmark.testRandomAddition[0]: [measured 10 out of 20 rounds, threads: 1 (sequential)]
 round: 0.49 [+- 0.07], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 16, GC.time: 0.01, time.total: 9.91, time.warmup: 5.06, time.bench: 4.86
BitmapCreationBenchmark.testLinearAdditionDescending[0]: [measured 1000 out of 1010 rounds, threads: 1 (sequential)]
 round: 0.01 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 74, GC.time: 0.03, time.total: 5.82, time.warmup: 0.06, time.bench: 5.76
BitmapCreationBenchmark.testToImmutableByteArray[0]: [measured 1000 out of 1010 rounds, threads: 1 (sequential)]
 round: 0.00 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 0, GC.time: 0.00, time.total: 1.80, time.warmup: 0.02, time.bench: 1.78
BitmapCreationBenchmark.testRandomAddition[1]: [measured 10 out of 20 rounds, threads: 1 (sequential)]
 round: 0.00 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 0, GC.time: 0.00, time.total: 0.12, time.warmup: 0.08, time.bench: 0.04
BitmapCreationBenchmark.testLinearAdditionDescending[1]: [measured 1000 out of 1010 rounds, threads: 1 (sequential)]
 round: 0.00 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 10, GC.time: 0.01, time.total: 4.26, time.warmup: 0.04, time.bench: 4.22
BitmapCreationBenchmark.testToImmutableByteArray[1]: [measured 1000 out of 1010 rounds, threads: 1 (sequential)]
 round: 0.01 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 27, GC.time: 0.01, time.total: 5.11, time.warmup: 0.05, time.bench: 5.06
BitmapCreationBenchmark.testLinearAddition[0]: [measured 1000 out of 1010 rounds, threads: 1 (sequential)]
 round: 0.00 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 0, GC.time: 0.00, time.total: 3.48, time.warmup: 0.04, time.bench: 3.45
BitmapCreationBenchmark.testLinearAddition[1]: [measured 1000 out of 1010 rounds, threads: 1 (sequential)]
 round: 0.00 [+- 0.00], round.block: 0.00 [+- 0.00], round.gc: 0.00 [+- 0.00], GC.calls: 9, GC.time: 0.00, time.total: 2.95, time.warmup: 0.03, time.bench: 2.92
2014-11-13 12:47:23,995 INFO [main] io.druid.segment.data.BitmapCreationBenchmark - Entry [0] is io.druid.segment.data.ConciseBitmapSerdeFactory
2014-11-13 12:47:23,995 INFO [main] io.druid.segment.data.BitmapCreationBenchmark - Entry [1] is io.druid.segment.data.RoaringBitmapSerdeFactory
Add copyright notice to BitmapCreationBenchmark
RealtimePlumber: Bail out of persist-n-merge of abandoned sinks (fixes #812).
Add deserialization benchmark to BitmapCreationBenchmark
add tests for empty sequences
fix results ordering
refactor sequence merging method to simplify testing
add test for out of order merging
fix retry to actually return correct sequences
Merge pull request #869 from metamx/fix-results-ordering

Fix results ordering on broker
Remove getIntervalString from BySegmentResultValue