Merge remote-tracking branch 'origin/2.0'

add ignoring obsolete folders

Merge remote-tracking branch 'origin/1.6'

Merge remote-tracking branch 'origin/1.5'

Merge remote-tracking branch 'origin/1.5'

Merge pull request #442 from STARInformatics/aux-graph-schema-path-typo

aux-graph-schema-path-typo

Merge remote-tracking branch 'origin/1.4'

Merge remote-tracking branch 'origin/1.4'

Merge pull request #423 from NCATSTranslator/fix_example_typo

Fix example typo in Metaknowledge Graph Example JSON

small commit to fix things?