Link to DDG search if no results could be found

New feature:

• Link to DDG search if no results could be found

See http://rpadovani.com/ddg-013/

v0.1.2: Merge pull request #2 from rpadovani/homepage

• Added new homepage
• Improved previews
• Improved footer

Related results

Added related results in a carousel, search for 'apple' or 'pin' to have some examples