subTreeLike and everySubTreeLike methods

[hartzis]

Added subTreeLike and everySubTreeLike methods and tests. #9 (comment)

Solves #22.

[donabrams]

Why is 'isLike' a string instead of a boolean?

[glenjamin]

isLike is a string because I hate seeing mysterious booleans at the call site.

funcCall(true)
// vs
funcCall('isLike')

Bit busy this weekend so proper review might be Monday, looks good at first glance though 👍

[hartzis]

I did the isLike because i saw the use of 'one' here https://github.com/glenjamin/skin-deep/blob/master/skin-deep.js#L211

I could also see using an options object instead:
createFinder(query, predicate, {'isLike': true});

But then you'd probably need to default options to an empty object.

[glenjamin]

Released as v0.12.0