Create Diazo basic theme

[rodfersou]

• Add a simple example of index.html for Diazo theme at webpack template
• Figure out how to handle rules.xml in webpack template

[rodfersou]

It looks to be possible to inherit scss files from remote host: https://stackoverflow.com/a/22337878/2116850 and http://sass-lang.com/documentation/file.SASS_REFERENCE.html#import

This way we can preparate a template inheriting from brasil.gov.temas scss files for example

[rodfersou]

need to finish #23 before this