Changing abs() to accept Double instead of Int

[Tschis]

As requested on #24.

Changing abs() to accept Double instead of Int in FunctionalLoops lesson, which solves compilation problems in isGoodEnough().

@jdesiloniz I needed another PR because I deleted my previous fork.

[jdesiloniz]

Thanks!! LGTM!

[jdesiloniz]

@Tschis Hi Rodolfo. I've introduced a small change in our tests for this exercise library as one of them was a little bit flaky and it was in the way to make this PR go live: #27.

Could you please update this branch with that change so we are good to merge? Thanks a lot!!

[Tschis]

@jdesiloniz Hi! I'm having troubles with the merge because there's an aux folder in src/main/scala/scalatutorial. Apparently, Windows has problems with that, so my checkout fails.

I get:

fatal: cannot create directory at 'src/main/scala/scalatutorial/aux': Invalid argument

[jdesiloniz]

@Tschis Hey! I don't know what could be the cause of your issue with Windows... I tried clonning your repo and bringing the changes from the main one and didn't have any trouble (I'm on OSX). I couldn't push my branch into your repo because of permission issues, but just in case could you try bringing the changes following the steps here? (https://gist.github.com/CristinaSolana/1885435)

Thanks!

[jdesiloniz]

@Tschis nevermind, I think we can merge this, as the new change will be on master anyway and your PR doesn't affect those tests. Merging!

[Tschis]

@jdesiloniz Thank you!

About the problem: aux is a reserved word on Windows, so you can't create a folder with that name. Which means Windows users can't clone the repository as it is now.

From what I've read, only renaming the folder or cloning it in a docker like container would solve it.

[jdesiloniz]

@Tschis I've created a PR to fix that issue, wasn't aware of it! Thanks a lot!! #29