Added configs to set the labels position.

[bastiao]

I just created options to set the label position of the axis. I just added label_position to keep backport compatibility. Do you have other suggestion?

By the way, is possible that padding bottom is broken?

[masayuki0812]

Hi, is the purpose of this option is to change the position of label to outside of axis?
If so, I think It's reasonable to add an option for it and I'll do it.

And currently, there is no option for padding.bottom and it is needed to expand axis region for the label moved. I think it's better to be done with the option I wrote above.

[bastiao]

Yes, it is! So I agree.

My problem is: when I tried it works very fine in the Y. But in the X it was cutted off. Any idea?

Are you going to do that?

[masayuki0812]

OK, I see. I'll add an option for the position of labels.

The reason of cut off is that the size of region of axis is limited by height 40 (I think). So if position is over that, it will not be shown. For y axis, there is a padding for the left. So it can be shown.

[bastiao]

Can you fix that? It will be great!

[masayuki0812]

Yes, please give me some time. I create the issue #59 for that, so I close this PR.

[masayuki0812]

@bastiao I added axis.x.label.position and axis.y.label.position. Please try these.
Sample is here http://c3js.org/samples/axes_label_position.html

[bastiao]

It's perfect!!

By the way, not all your samples are in github. You should add to keep consistency. :) Thanks!