Add test case to problem 114 Global take-while

There should be a test case whose answer is the whole collection to catch solutions which forget to check when they reach the end of the collection. Example test case:

```
(= ["this" "is" "a" "sentence" "i" "wrote"]
   (__ 100 #{"a"}
         ["this" "is" "a" "sentence" "i" "wrote"]))
```

Currently, solutions which would run forever on this test case pass all of the existing tests.
