removing null values from the list that MoreFutures.aggregate returns
upticking versions
Merge pull request #26 from iplayer/aggregate_with_null_objects_removed

Aggregate with null objects removed
Merge branch 'master' into recEngRefactor

Conflicts:
	src/main/java/uk/co/bbc/iplayer/common/concurrency/MoreFutures.java
Fixed after merge with master