DRYer code, less indents, default directory

[B7th]

Added a bit of functionality by making the directory of the file being concatenated the default one, as well as making it more readable at least in appearance, using right handed expressions, getting rid of doublings as well as curly braces.

[fairfieldt]

Hey, thanks for the pull!

It's a bit hard to look at with all the whitespace changes - could you move the whitespace changes to their own pull (I'm definitely open to the change, but I'd really like to do it separately)

[B7th]

Sure I made a new patch on another pull request that will do the whitespace, and I think once you accept it this pull should be easier to read, agreed with you on that. Let me know what you think of the changes!

[fairfieldt]

Thanks! I'll try to take a look at this stuff tonight.

[fairfieldt]

I merged the first patch, minus the require changes - I'd prefer to keep the explicit require calls.

Can you update this pull to remove the whitespace changes? I'd love to get it in.

[B7th]

Sure! I made a new pull to keep things separate, I hope this helps :)