make ROLLUP_DELAY_MILLIS configurable. Defaults to 5 mins
fix refactor typo in property name.
Change the cache expiration policy to reduce GC

The 'expireAfterWrite' expiration policy is causing excessive GC during
high load. Since we're going to be seeing the same things over and over
again, it is better to expire things from the cache when we stop seeing
it. This will reduce the amount of GC.
Update insertedLocators comment to reflect new expiration policy
Update blueflood graphite finder with rudimentary support for preagg

Preaggregated metrics have different default attributes than regular
metrics. A more comprehensive solution will need to be devised that
exposes these different values that blueflood calculates. For now, this
change will allow users to graph metrics sent into blueflood using
statsd.
Making Zookeeper integration code more readable.

* Making more variables into `final` so that the state modification is more controlled.
* Adding comments in various places, especially regarding the lock states.
* Adding zookeeper bootstrapping to the test suite, and moving the test out of the integration test (in fact, this test was blacklisted and was never executed).
* Reducing the usage of the mockito whitebox.
* Reducing the amount of shared states, by pulling the scavanger state out of the member variable and storing it within the function scope.
* Removing the usage of `java.util.Timer`.
* Separating out the zookeeper connection wait outside the constructor - that makes the tests more reliable, since having the lock managers in disconnected state is most likely bad.
Updated copyright
Revert "Reordered alphabetically"
 	Will add in another PR

This reverts commit 8324c2c0f98bb2d770c14976bfb6ed63a27ca8e6.
Revert "Adding configurable string metrics droppage support"

This reverts commit 0d387fc37dbc913eb4a2fdfc5b7ced35218e76ce.

Conflicts:
	blueflood-core/src/main/java/com/rackspacecloud/blueflood/service/CoreConfig.java
Merge pull request #18 from tilogaat/clean_string_metrics_optimizer

Clean string metrics optimizer