bump min ios sdk to 8.0, since that's what we specify in the runtime build anyway.
bump min ios sdk to 8.0, since that's what we specify in the runtime build anyway.

toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs