Arrow function custom rules

[cjihrig]

See outmoded/hapi-contrib#58 (comment)

• enforce arguments parentheses (done)
• parentheses around object creation allowed ((foo) => ({ bar: foo })) including line breaks in the {} (nothing needed, the language takes care of this)
• no function creation with implicit return (() => () => 42) (need a rule for this)
• allow single statements on single line to use implicit return without {} (update to hapi-scope-start@2.1.0)

UPDATE: Just need a new rule for no function creation with implicit return.
UPDATE: no-arrowception rule created to detect implicitly created arrow functions.

[cjihrig]

This has all been done. See #19 now.

[lock]

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