fix a bug for EWah: when a word's 31 bit is 1, and one or more zero words is followed, the currentbit can not be taken as returned result
fix a bug for EWah: when a word's 31 bit is 1, and one or more zero words is followed, the currentbit can not be taken as returned result

pombredanne/izenelib,izenecloud/izenelib,izenecloud/izenelib,izenecloud/izenelib,izenecloud/izenelib,pombredanne/izenelib,pombredanne/izenelib,pombredanne/izenelib