Update gulp release to include Fonts folder

[juliaelman]

The current gulp release task does not include the Fonts folder. We need to update this task to include this folder so that users are provided all of the assets they might need to make these files work correctly for their chosen application.

Refs #37

[shawnbot]

I took a stab at this last night and had a hard time because it wasn't clear (without switching between branches and running gulp release) what the structure of the resulting zips is supposed to be. We have smoke tests for files in the repo, but none for what the zips should produce. 😢

[juliaelman]

@shawnbot from what I understand about this issue, we are just looking to include the Fonts folder with the assets. Here is an example of what the output folder structure might look like:

  uswds-assets-ai/
  ├── Colors/
  │   └── web-design-standards-colors.ase
  ├── Components/
  │   ├── Components_sticker_sheet.ai
  │   └── Components_sticker_sheet.pdf
  ├── CONTRIBUTUNG.md
  ├── Fonts/
  │   ├── Font_Awesome.zip
  │   ├── Merriweather.zip
  │   └── Source_Sans_Pro.zip
  ├── LICENSE.md
  └── README.md

I think I found the problem. We currently have the path for the font folder set incorrectly. It should just be Fonts. We should also exclude the config folder here.