Re-enable TestAsk

[cben]

Those got disabled in https://github.com/AlecAivazis/survey/pull/216/files#diff-3a029c8ea50304c9dc5637560df2375bc28f1620d72744a13f4d3c152bb16a4aR120 and apparently were forgotten since then?

I noticed several tests, some here and some in other files, sometimes get stuck when running go test -v.
Everything works reliably without -v, so I guess there are timing issues due to verbose printing; but when focusing on a single test with -run=REGEXP they also work pretty reliably even with -v.

• Exception: I kept the "What days do you prefer" test commented out because it always gets stuck, with or without -v, and I don't know how to debug it (-v doesn't help — it doesn't get to show "raw output" which is usually very helpful).

[cben]

@AlecAivazis please review.

[AlecAivazis]

Thanks for hunting this down @cben!