O. volvulus  - fpkm data wasn't showing

Was returning undef even if there was RNASeq_FPKM data in ace. Wrote a fix and updated tests.

Page for testing:
/species/o_volvulus/gene/WBGene00243220#01f--10


@KenanHabib - could you take a look and merge this PR? It touches some of you code for adding the analysis link.