Redesign global header.

Also cleans up some of other files such as Gruntfile and so on.
Merge branch 'header'
Organise folder structure of less files.

Separate variables and mixins.
Add footer.

Linking to the amazing product and services. Oh how I love them.
Merge branch 'footer'
Add meta description.

meta description will be fetched from each page's yaml data to make it
more clear and flexible.
Add cover section to home page.

Added gray noise to body as well.
Add post excerpt style to home page.
Add single post page and styles.

Permalink is also set.
Refresh site design.
Add my first post.
Merge branch 'home'