Implemented a custom 'sequence' property for transcript annotations which concatenates sequences of exons instead of just pulling the whole transcript region.
Implemented a custom 'sequence' property for transcript annotations which concatenates sequences of exons instead of just pulling the whole transcript region.

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