improve gulp template task, provide support for subdirectories

[timaschew]

with this change you can also create subdirectories within the content/xy
the important part was to change the destination for the output file. I also extracted two functions to into a util file.

[Fishrock123]

cc @therebelrobot

[therebelrobot]

+1 to this. Modularity is awesome-arity. So long as it works, I'm good. I'm going to be hitting this up tonight to make it async, and this will help alot.

[timaschew]

yes it works, I continue development and switch to jade and add a blog.
this time I converted the medium articles from html to markdown via a converter website, but this can also be done via an automated script.

anyway, can see the result here: http://timaschew.github.io/website
and here is the code: https://github.com/timaschew/website/tree/blog-with-jade