Create %{_datarootdir}/opentsdb/plugins in rpm.

The folder %{_datarootdir}/opentsdb/plugins is required for opentsdb to
start and should be created by the rpm when installing.

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Fix CLIQuery usage command for downsampling per #314

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Change short to int in Span.java to fix precision loss and support larger
sets

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Update Thanks and News for RC3

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Fix incorrect downsampling unit
The bug incorrectly assumed the downsampling unit was second while computing
start and end time of HBase scan.
- Fixed the math.
- Suffixed the field name with _ms.
- Added unit tests to address the bug.
  * downsample and downsampleMilliseconds.
- Added a nested helper class for unit tests to access private methods.
- Factored out the unit tests related to downsampling from the huge
  TestTsdbQuery.java. It was too big for Eclipse to run.

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Upgrade to Guava 17 and use direct URLs to Maven Central.
Upgrade to Netty 3.9.1.