gulpjs
* new spritesmith plugin
* reworked exports
* new nunjucks-render version fixing dependency issues!
File structure
New naming scheme for nunjucks files. Underscore used for files which
are imported and not directly displayed.
Nunjucks blocks where renamed and are placed differently.
New macro for navigational elements.
- changed .gitignore for art folder
- add gulp processing for art
- changed nunjucks templates file structure to reflect demo files
- removed file for new styles
- renamed most sass variables
- added sass function for space classes
- great progress with content of the intro page
- moved old gulp tasks to DEPRECATED.md
