fix #1255 assume lift gates are passable

lift gates are commonly found on industrial parks or businesses, delivery drivers need to route to these, most gates are permissive and open in daytime, this patch won't route through gates where access is specifically no.
test case for lift gate access
Merge pull request #1 from AlanBell/master

test case for lift gate access
Merge pull request #1256 from AlanBell/patch-1

fix #1255 assume lift gates are passable