[FIX] run test by _mocha to capture coverage
[FIX] run test by _mocha to capture coverage

wilsonianb/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,wilsonianb/ripple-lib,wilsonianb/ripple-lib,darkdarkdragon/ripple-lib,darkdarkdragon/ripple-lib,darkdarkdragon/ripple-lib