Update to WPF v0.1.5 (Foundation v4.0.9)

- Update Foundation to v4.0.9
- Added a new function wpf_breadcrumb()
- Added wpf_breadcrumb() to content.php and single.php
- Added function_exists() for every function in functions.php (so child
themes can override the function if needed).
- Centered tag's and number of comments (post's)

Stay tuned for more!