Add defaultTo function

[jonathanmoore]

What are you trying to accomplish with this PR?

Fixes #113
Following the lead of PR #78, Lodash's _.defaultTo function was added to slate.utils

Now the formatWithDelimiters function inside slate.Currency can correctly apply a default value of 2 if the precision argument equals 0—as well as any other place where a default variable needs to be set.

https://github.com/lodash/lodash/blob/master/defaultTo.js

slate.utils.defaultTo(1, 10)
// => 1

slate.utils.defaultTo(0, 10)
// => 0

slate.utils.defaultTo(undefined, 10)
// => 10

Checklist

For contributors:

• I have updated the docs to reflect these changes, if applicable.

For maintainers:

• I have 🎩'd these changes.
• I have bumped the package.json version in a separate PR, if applicable.

[NathanPJF]

Some quick changes to addresss

[NathanPJF]

This will need to be defined as a property of utils.

defaultTo: function(value, defaultValue) {
  return (value == null || value !== value) ? defaultValue : value
}

[NathanPJF]

need a comma after the } above to add another property to slate.utils

[jonathanmoore]

Thanks for catching that! This should take care of it.

[NathanPJF]

Awesome! Thanks for both reporting the issue and getting the PR in @jonathanmoore

[jonathanmoore]

🙌 I'm glad to help! I've been using Slate for the last few months when I converted our premium theme District over to support sections. It has been tremendously helpful.

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