* 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.