Added tests for cdna_start(), cdna_end(), cdna_coding_start(), cdna_coding_end(), coding_region_start(), and coding_region_end() on exons.
Added tests for cdna_start(), cdna_end(), cdna_coding_start(),
cdna_coding_end(), coding_region_start(), and coding_region_end() on
exons.

Current API and test DB passes the tests.

muffato/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,danstaines/ensembl,willmclaren/ensembl,Ensembl/ensembl,muffato/ensembl,mjg17/ensembl,danstaines/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,at7/ensembl,at7/ensembl,at7/ensembl,mjg17/ensembl,mjg17/ensembl,Ensembl/ensembl,at7/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,mjg17/ensembl,muffato/ensembl,muffato/ensembl,willmclaren/ensembl