Common changes for Scala[Option, Map, Multi]Binders.

[nbauernfeind]

I ended up writing some code for ScalaMapBinder as well and ended up refactoring quite a few things and coming up with something that's slightly cleaner for ScalaOptionBinder and ScalaMultibinder.

This pull request is the common stuff across all three of them; so you'll probably want to look at it first as you'll see these changes in each of those pull requests too.

[tsuckow]

The last commit should really be applied after the option/map/multi changes. I'll rebase it myself.

[nbauernfeind]

I agree. Only reason I hadn't is because github doesn't handle dependent pull requests very well. I've pulled it out of the PR; I'll create a new one as soon as the other changes are merged.

[nbauernfeind]

I hadn't realized you pushed them manually to the develop branch already. I noticed github, for some reason, hadn't noticed you already merged those commits from those pull requests. So I 'touched' the branches to get github to ignore those commits. This PR now contains only the readme as well.

[nbauernfeind]

Anything else cross your mind @tsuckow?

[tsuckow]

So far, nothing else is on my mind. It just takes me a while to read through it and make sure I am satisfied with how it works. It doesn't help that I have been on two work trips in the last week. I also had to buy a new car before my old one left me completely stranded. I have a family obligation this weekend, but hopefully can continue sunday evening.

Thanks for all your hard work Nate! And happy belated birthday!

[tsuckow]

Alright. If you could make sure I haven't screwed up your changes somehow, that would be awesome. If you have time, I would like to resolve #34 before rolling the 4.0.0-beta5 release. If not I will hopefully get to it in a few days. Then comes remembering how to do maven central.