Slight refinements on website look and feel.

- Changed page header texture.
- Removed old page header, footer and background textures.
- Slight changes to page typography.
- Using plain texts to announce posts date.
- Using lesscss to make management of color sets easier.
Light grey navigation bar links.
Small changes to the Atom feeds.

- Reformated Atom feed.
- Only generating Atom feed for last 10 published site news.
- Allowed minification of Atom feed during site generation post process step.
Integrating PureCSS.
Shuffling website navigation links and making them more accessible for visitors.
Front page overhaul.

- Bringing a big and nice download button to the front page.
- Limiting news count to 3 on the front page.
- Using a responsive design.
Compact Version history and News archive pages.

- Only listing post titles in mentioned pages.
- Upgrading Pure CSS to 0.3.0.
Very small change on Documentation page.
Download page overhaul.

- Responsive design.
- Added list of popular GLFW bindings.
- Very small change to the style sheets.
Updated post layouts to HTML5.
Beautiful tables.
Responsive design for Media page.
New custom Jekyll plugin to bring Pure CSS Grids functionality into markdowns.
Replacing index.md HTML tags used for grids with new Jekyll grids plugin.
Replacing download.md HTML tags used for grids with new Jekyll grids plugin.
Splitting Media page entries into separate posts.
Integrating changes suggested by @elmindreda .

- Removing copyright notice from page footer.
- Temporarily disabling page footer.
- Fixed GLFW 3.0.2 changelog post.
- Small change to buttons appearance.
- Slight changes to the Documentation, Download, FAQ, Home and Media pages.
Bringing back Version history page previous look, so it can be easily searched.
Using global variables to keep track of latest release.
Using a cleaner method to access latest post.