finished systemjobs, index ranges, ES 0.90.1
systemjobs api
fix import
typo changes
ES cluster health APIs
getting ES fields of an index failed with empty indices
moved activties to new mongo models
make Persisted abstract class, remove Persistable

cc @kroepke
more abstract class goodness
system messages, properly serialize jodatime
have datetime fields as mongodb dates
started userwarnings
fix import
system notifications API
system notifications API
added GET systemjob API, moved restresource
work on system APIs
remove debug sleep statement
you can now pause/resume message processing. other stuff
Merge branch '020' of github.com:lennartkoopmann/graylog2-server into 020