Merge pull request #9 from gretchiemoran/master

added impl for new base XUL API ... clear()
[PDI-8052] MongoDB Input Step - Support doing lookups in JSON query and agg pipeline.
Merge pull request #10 from m-a-hall/master-addLookupStuff

[PDI-8052] MongoDB Input Step - Support doing lookups in JSON query and agg pipeline.
Merge commit 'ccc5a02951803e634d9ad48f57f926aca22a2993'