add scopes[] to the FilteringTerm

[redmitry]

The patch is the response to the several discussions #93, #94.

beaconFilteringTermsResults.json FilteringTerm should provide a list of scopes (entryTypes) the filter may be applied,

Dmitry

[costero-e]

Everything looks fine except for the example, as we have discussed in person,
the json should look like this:

                    "examples": [
                        ["individual", "biosample"]
                    ],

The yaml looks good but without the commas.

[jrambla]

It looks good to me.
Not to be corrected in this PR, but the example "Human Phenotype Ontology" is wrong as it is not part of the type enum.