- Implement gdcQuery to set up queries
- Implement "smart" setters and getters for gdcQuery
- filtering
- facets
- fields
- Implement fetch functionality for gdcQuery
- Implement count functionality for gdcQuery
- Implement aggregation fetching for gdcQuery
- Bulletproof mapping
- rectify data download functionality with gdcQuery
- fix manifest behavior with gdcQuery
- implement GDCBam class as S4 class
- methods for slicing with GRanges objects
- methods for reading (with/without download)