v0.013

	Added exon feature ranks. Added clear step when creating EnsEMBL registry.
Added optional (never used) target_region_start / end to _ins_del_vector_seq so that we can make intermediate / final vectors for gibsons
Merge branch 'master' of github.com:htgt/Eng-Seq-Builder
v0.014
Build results of 3c272ad on master