opStrategy and ordering for ArithmeticPostAgg

Fixes #510
update guava, java-util, and druid-api
Merge branch 'master' of github.com:metamx/druid into new-guava
Merge branch 'master' into new-guava

Conflicts:
	server/src/main/java/io/druid/server/QueryResource.java
address code review
Merge branch 'master' of github.com:metamx/druid into new-guava
fix bad merge
Merge branch 'master' into new-guava
all manners of new tests
[maven-release-plugin] prepare for next development iteration
Merge pull request #578 from metamx/new-guava

Update guava, java-util, and druid-api
remove snapshot dep
Fix example middle manager configs.
fix Zk setup problem
fix doc header
fix another doc problem
another doc fix
make ObjectStrategy cacheable
optimize lookups by caching bytebuffer copy
optimize single value lookup