Workaround for issue #244 of stratosphere
Fixed multi output operator serialization
Added workaround in post pass for Stratosphere Issue #206
Core functions and aggregations are now specified more fluently; Registries are more independent of Meteor through consequent usage of NameChoosers
Changed ozone version to 0.4-alpha.1; decoupled version of pact-testplan
Fixed most operator base test and ArrayUnion
Fixed array node deserialization
Added Internal annotation for all operators that should not be given to the end users (implementation details etc); Forced public operators to have Name annotation
Fixed parser for safe field access; Made TernaryExpression a PathSegment
Fixed meteor safe method test and named child iterator