Node >= 4 / es2015 updates

[mtharrison]

Summary of changes required:

• use strict
• const and let where appropriate
• arrow functions where appropriate
• relevant updates to tests + docs
• updating the engine in package.json

[hueniverse]

Also, avoid self and += / -= (not optimized yet for let const)

[devinivy]

Are you saying that var should be used with self = this rather than let?

[mtharrison]

@devinivy Avoiding altogether I think: hapijs/shot@129d6f6#diff-6d186b954a58d5bb740f73d84fe39073L83

[katherine-barn2door]

Is there a list of the breaking changes?

I found this was definitely breaking when I went from 2.x to 4.x. I'm wondering if there's anything else.

92b2e60

[lock]

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