streams api working
simplified json generation in rest resources
datevalidator now checking for utc/jodatime, validations are only run on save (not load)
Merge branch '020' of github.com:Graylog2/graylog2-server into 020

Conflicts:
	graylog2-server/src/main/java/org/graylog2/rest/resources/streams/StreamResource.java
	graylog2-server/src/main/java/org/graylog2/rest/resources/streams/requests/CreateRequest.java
	graylog2-server/src/test/java/org/graylog2/buffers/processors/OutputBufferProcessorTest.java