Clean up imports on PartitionGraphStrategy.
Add javadoc.
Fix returned type definition on features for StrategyWrappedGraph.
Remove todo - maybe not so good an idea anymore.
Add method for strategy to inject on Element.label().
Renamed strategy methods for Element to match new API.
Implement Element.label injection in strategygraphwrapper.
Add strategy for Element.keys.
Add strategy method for Element.hiddenKeys.
Add strategy method for Element.values.
Add strategy method for Element.hiddenValues
Refactor default implementation for Element.value().
Merge remote-tracking branch 'origin/master'