Snapshot
Factored collectors out into separate classes
Tests passing, still need to implement ordinals->bytesrefs->payloads
More gentle refactoring, this time DistinctCollector
Fixed snapshot version number
postCollection cleanup
More performance/memory-related refactoring
Pretty much a test commit to see if new github perms work
Added changelog, updated readme
Merge branch 'feature/SmartCollectors' into develop
Merge branch 'release/2.1.0' into develop

Conflicts:
	pom.xml
Version numbers
Merge branch 'release/2.1.1'

Conflicts:
	README.md