kallisto translation

[roryk]

The kallisto output is mad confusing, I wrote some code to get back to something folks are used to looking at, it reformats the big matrix to have the set of transcripts as the row names instead of the index into the equivalence class matrix by going through the FASTA file and renaming them here:

https://github.com/chapmanb/bcbio-nextgen/blob/master/bcbio/rnaseq/kallisto.py#L75

That seems like it might go well here, what do you think Valentine?