Fix sequence_exon_cased method: The first exon was always in uppercase and the second one was in upper or lower case depending on the total number of exons.
Fix sequence_exon_cased method: The first exon was always in uppercase and the second one was in upper or lower case depending on the total number of exons.

ckongEbi/ensembl-compara,dbolser-ebi/ensembl-compara,dbolser-ebi/ensembl-compara,danstaines/ensembl-compara,kumarsaurabh20/ensembl-compara,danstaines/ensembl-compara,ckongEbi/ensembl-compara,kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,etapanari/ensembl-compara,Ensembl/ensembl-compara,dbolser-ebi/ensembl-compara,etapanari/ensembl-compara,etapanari/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,kumarsaurabh20/ensembl-compara,ckongEbi/ensembl-compara,etapanari/ensembl-compara,kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara