This PR fixes #359 by always wrapping arguments to not_ in parentheses when building SQL queries. Some tests combining not_ with &&. and ||. have also been added to Common.Test.

This is technically a breaking change: not_ (x &&. y) is no longer equivalent to (not_ x) &&. y, for example, although the equivalence is probably unintended.

Before submitting your PR, check that you've:

• Bumped the version number.
• Ran stylish-haskell and otherwise adhered to the style guide.
  • stylish-haskell fails to parse the DEPRECATED pragma for sub_select in Database.Esqueleto.Internal.Internal.

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