Decode 2.8.3

### Added:
- Option to show entry date for excerpts on the home page
- Steam User and Group social links

### Improved:
- Even faster loading, thanks to minified and concatenated styles and scripts
- Update button styling
- 404 page simplified
- Various improvements for WordPress 3.8
- Update screenshot (880 x 660)

### Fixed:
- Incorrect HTML id for 500px icon