Cleaned header, search and new post

- Removed roundness from search box;
- Removed shadows from menu;
- No need for a search layout, using the base layout instead;
- Removed facet renaming from JavaScript since it was not used;
- New post about integrating search into Jekyll.
fixed date in blog post filename
Put back baseurl
Merge pull request #25 from carlbolduc/master

 Cleaned header & search, new post