Search bar improvements

Embracing the power of CSS3 Placeholder.

From:
- Unfocused: http://i.imgur.com/rT8rTW9.png
- Focused:  http://i.imgur.com/pvfinjT.png

To:
- Unfocused: http://i.imgur.com/m3rPJfE.png
- Focused: http://i.imgur.com/rAfOjIy.png


**Note**: This is my **very first** contribution to open-source! Woohoo!