[TW-1871] CLI filtering appears to depend on order of terms when quoted

_Paul Beckingham on 2016-12-01T00:14:23Z says:_

These two filters behave differently:

```
$ task "( +WAITING or +PENDING ) and pro:home" all
$ task "pro:home and ( +PENDING or +WAITING )" all
```

The first command works and is parsed properly. The second command treats everything in the quotes as a single word to match on, and fails.

Removing the quotes and escaping the parentheses is a workaround.

Thanks to Eduardo Suarez-Santana.