Raise the secondary market royalty from 3% to 5%

We should raise the secondary market royalty from 3% to 5% on OpenSea and have the additional 2% go to the DAO. So for every secondary market sale going forward, 2.6% of the royalty would go to the DAO and 2.4% would go to the original developer (@fragosti) instead of 2.4% to the original developer (@fragosti) & 0.6% to the DAO.