streams/rollup: test single single event per interval
Graphite server: improve error handling.

Also improvements to tests, performance, modularity, removed dependency
on core.match, etc. Possibly fixes #338?
Uncomment integration test
Merge pull request #340 from pradeepchhetri/master

Added OpenTSDB plugin
Fixed messages not being read by logstash.
atomize deps tests
atomize fold-interval
atomize fill-in
atomize fill-in-last
atomize interpolate-constant
atomize ddt-events
atomize by-fn and by extension by
Merge pull request #342 from pyr/feature-atomization

Feature atomization
Coalesce: reduce race condition

Coalesce emitted a lazy sequence from a mutable iterator to downstream
children. Forces realization into a vector.
Merge pull request #341 from vvision/fix-logstash-msg

Fixed messages not being read in logstash.
folds/mean: Fix divide by zero on only events with nil metrics.
Merge pull request #343 from udoprog/udoprog/mean-divide-by-zero

folds/mean: Fix divide by zero on only events with nil metrics.
add support for size based log rotation
Merge pull request #344 from jespada/sizebased-logrotation

add support for size based log rotation
streams/batch: batch up events in space and time.

Especially useful for folks having performance issues with IO; for
instance, the librato metrics client can accept a vector of events and
will make a single HTTP request for the entire vector as a batch.