User interface design

Updated the User Interface design for the extension. The following changes have been made:
<ol>
<li>Updated the background and foreground color of the UI</li>
<li>Added a header to describe about the extension</li>
<li>Added a placeholder for the input fields describing what input the user is supposed to give</li>
<li>Updated the submit button icon</li>
<li>Update the jquery version from 2.1.1.min to 2.1.1 for full support and more features</li>
</ol>

The images of the updated UI of the extension are as follows:<br>
Image as an extension in chrome<br>
![extensionimage](https://cloud.githubusercontent.com/assets/9867103/5161718/8a6fbdf4-73d6-11e4-893c-3cdd20ea431f.png)<br>
Image as an html file displayed in the browser<br>
![browserimage](https://cloud.githubusercontent.com/assets/9867103/5161735/f1405e6c-73d6-11e4-8eef-0cb284fd1f63.png)