bs_vote: added mean among votes and use of logloss() to return loss
bs_vote: tests 68 and 69 added for multiclass case
bs vote: removed getLoss support and avg on mean (commented)
dna demo tweaks
Merge pull request #369 from pmineiro/dna_demo_fixes

dna demo tweaks
Merge pull request #368 from doxav/bs_vote_fix_and_multi

Cleaned PR: bs vote fix and multi