Batch rollup reads

https://github.com/rackerlabs/blueflood/pull/263
Merge pull request #268 from fourk/batch_rollup_reads2

Batch rollup reads
fix concurrency issues around iterating the keyset for batch reader
Merge pull request #269 from fourk/fix_concurrency_with_batch_reads

fix concurrency issues around iterating the keyset for batch reader
avoid concurrentmodificationexception
Merge pull request #270 from fourk/fix_concurrency_with_batch_reads

avoid concurrentmodificationexception
first pass at adding riemann reporter by itself
Use the same version of metrics as the rest of BF
Merge pull request #271 from dlobue/remove_yammer_metrics_from_http

Use the same version of metrics as the rest of BF
fix typos and catch IOException
Run integration tests against cassandra 2.0

- Add profile to set cassandra maven plugin version to 2.0
- Run integration tests against cassandra 2.0 by default since that is
  what we will be running in the new prod environment.
Remove openjdk6 from travis test matrix

the cassandra 2.0 maven crashes when run against java 6.
add comments to riemann configs with usage
Update changelog with mention of RiemannReporter
Merge pull request #272 from dlobue/riemann_reporter_alone

Add metrics reporter for riemann
cleanup -- remove scribe references
rename getType to getDataType
rename getValue to getMetricValue
break DataType out into separate file as per TODO
add an equals method to metric