Fix Guava imports
add id field to ChildRef
simplify child ref id
add id codec to container summary resolver
Update ChildRefUpdateTask to set numeric IDs across content refs
Create SeriesIdentifier for series, which includes series number
SeriesRefs are no longer ChildRefs
Merge branch 'mbst-4764-add-series-to-sub-items' into stage

Conflicts:
	src/main/java/org/atlasapi/ConfigurableAnnotationWebApplicationContext.java
	src/main/java/org/atlasapi/equiv/ChildRefUpdateTask.java
	src/main/java/org/atlasapi/output/simple/ContainerModelSimplifier.java
	src/test/java/org/atlasapi/equiv/ChildRefUpdateTaskTest.java
	src/test/java/org/atlasapi/equiv/scorers/ContainerHierarchyMatchingScorerTest.java