Add basic branching.

[rstone770]

Hey

I added simple branching support to your project. It allows for basic else/else if branching which i find very useful in my own projects.

great job on the library btw.

[atticoos]

This is very elegant, nicely done.

Branching is something I've been wanting to take a look at, but haven't had time to sit down and really think about what that design should look like.

I had originally been thinking about something like:

renderIf.condition(
  renderIf.if(foo === 'bar')(
    <span>Is bar</span>
  )
  .elseIf(foo === 'foo')(
    <span>Is foo</span>
  )
  .else(
    <span>Something else</span>
  )
)

But I like the simplicity of the or idea here.

Going to spend a day thinking about this, but I do lean towards looking at merging this. Thanks for contributing

[atticoos]

Hey @rstone770 - would you like to take a look at #13? I've been thinking about the most ergonomic way to approach this and am pretty happy with the results. Curious to hear your thoughts.

I'm still interested in this approach as well, perhaps both