Search on revision_date

[frankinspace]

Add option to search for granules by revision_date.

• Add revision_date function to Query class (need to verify revision_date is not specific to only some concepts, I think it applies to all CMR concepts)
• Add test to verify documents are included/excluded based on their revision_date
• Add example usage to README
• Update CHANGELOG

[nikki-t]

@frankinspace - I think it may make sense to place the revision_date function in the GranuleCollectionBaseQuery class as the revision_date query parameter can be used for both Collection and Granule based searches but not for Services, Tools, or Variables.

If we place the function in the Query class which gets inherited by the Tool, Service, and Variable classes then we are creating a function in the parent class that can't really be used by the child classes. Does that seem right? (At least this is my understanding based off the CMR API documentation)

[chuckwondo]

@frankinspace - I think it may make sense to place the revision_date function in the GranuleCollectionBaseQuery class as the revision_date query parameter can be used for both Collection and Granule based searches but not for Services, Tools, or Variables.

If we place the function in the Query class which gets inherited by the Tool, Service, and Variable classes then we are creating a function in the parent class that can't really be used by the child classes. Does that seem right? (At least this is my understanding based off the CMR API documentation)

Yes, that's right.

[frankinspace]

Thanks for confirming, yes I wasn't sure what 'level' it would apply to in the original description. Sounds like GranuleCollectionBaseQuery is appropriate