Add syntax for validated.

[coltfred]

Add syntax to values for lifting them into Valid, Invalid and the Nel versions of those. Currently no tests as I was unable to figure out which mechanism was preferred for testing syntax.

Let me know how that should be done.

Addresses #585.

[codecov-io]

Current coverage is 75.97%

Merging #587 into master will decrease coverage by -0.31% as of 3f003e7

@@            master    #587   diff @@
======================================
  Files          158     159     +1
  Stmts         2172    2181     +9
  Branches        68      68       
  Methods          0       0       
======================================
  Hit           1657    1657       
  Partial          0       0       
- Missed         515     524     +9

Review entire Coverage Diff as of 3f003e7

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[ceedubs]

👍

I would vote for merging this and creating a separate issue for testing syntax. And possibly another one for whether we should be using Eval instead of by-name params for these?

[ceedubs]

By the way, thanks @coltfred!

[julien-truffaut]

👍 I agree with @ceedubs we should discuss Eval and test in a separate issue

[coltfred]

No problem!