Search through posts

- Create new page for search
- Add link in the header to the search page
- Include styles for search input and results
- Include default empty text when there are no search results to display
- Rename search/search.json -> search/search-data.json
- Move initial JS code search.js to _includes/search.js
move search javascript file to js directory inside _includes
Merge pull request #16 from akenn/search

Search