Allow predicate to be subset of props

[hartzis]

This allows for the predicate to be an actual subset of the props. Solves what we were going for with #22 , and doesn't break any of the current tests.

Please let us know if this is this the direction you were going with Expand subTree functions to accept (selector, predicate).? #9 (comment)

[glenjamin]

The tests are a bit light on this area - the intention was for this to be available as subTreeLike - to match the existing findComponentLike

[hartzis]

subTreeLike and everySubTreeLike will definitely solve what we are trying to do with #22

Apologies, for missing #9 (comment).

We are trying to not tie ourselves to html structure/presentation (classes/ids) and are excited to get our hands on those methods.

[glenjamin]

I'm going to close this, but feel free to reopen if you want to add the Like methods.

[hartzis]

Awesome, I'll give it a whirl today.