Validation stops upon error in first list item

When passed a list, Voluptuous doesn't complete checking the entire list and returns only the error from the first malformed list item.

**Schema:**
`schema = Schema([{'name': str}])`

**Data and validation:**

```
try:
schema([{'name': 123}, {'name': 123}])

except MultipleInvalid as e:
for error in e.errors:
print(error)
```

**Expected output:**

```
expected str for dictionary value @ data[0]['name']
expected str for dictionary value @ data[1]['name']
```

**Actual output:**
`expected str for dictionary value @ data[0]['name']`