Renamed EnsemblSliceInfo to EnsemblExonSliceInfo and moved it to where the other exon-related classes are.
Renamed EnsemblSliceInfo to EnsemblExonSliceInfo and moved it to where the other exon-related classes are.

RitwikGupta/pygr,RitwikGupta/pygr,GenDataPro/pygr,GenDataPro/pygr,theoryno3/pygr,cjlee112/pygr,theoryno3/pygr,GenDataPro/pygr,cjlee112/pygr,cjlee112/pygr,cjlee112/pygr,theoryno3/pygr,RitwikGupta/pygr