* Remove node 7 and introduce node 8 in travis config Progress on #5804 * Run yarn install with node 8 Progress on #5804 * Remove expose_debug_as from tests; replace with expose_gc_as Fixes #5804 * Remove dashed options since they aren't listed * Revert "Remove dashed options since they aren't listed" This reverts commit f826167e320ee85331e09ac63b5674401cac6236.