Added clear button to clear search values box

Fix #528

current look
![screen shot 2014-05-07 at 12 52 44 pm](https://cloud.githubusercontent.com/assets/2774472/2907338/2f582acc-d61b-11e3-8c7b-49a26b8e1d26.png)

Signed-off-by: Sheik Hassan <solergiga@yahoo.com>