Change name of get_mutations_ccle to get_ccle_mutations
Change name of get_mutations_ccle to get_ccle_mutations

- consistency with other functions
pvtodorov/indra,johnbachman/indra,sorgerlab/indra,johnbachman/belpy,johnbachman/indra,sorgerlab/belpy,johnbachman/indra,bgyori/indra,sorgerlab/belpy,pvtodorov/indra,sorgerlab/indra,sorgerlab/indra,johnbachman/belpy,bgyori/indra,pvtodorov/indra,johnbachman/belpy,pvtodorov/indra,bgyori/indra,sorgerlab/belpy