add option to show subtitle if only one marker is in a cluster
reset subtitle if annotation is showing a cluster with more then one marker
do not put annotations into the removal list that do not inherit from RECluster
Merge pull request #3 from toto/feature/subtitle-annotations

Add option to show subtitle if only one marker is in a cluster
Merge pull request #4 from toto/feature/do-not-constantly-remove-user-annotation

Do not put annotations into the removal list that do not inherit from RECluster
Version bump (2.0.1)
Update readme
Remove unused variable
Deprecate clusterize taks, now user clusterize:
Update comment
Version bump (2.1)
Update readme
Remove setRegion method, since clusterer now is a separate object from MKMapView
Update comments
Minor refactoring
Minor code refactoring
Fix subtitles for single markers
Version bump (2.1.1)
Update readme
Update readme and screenshot