Implementing Card UI and some UI improvements

Implemented Card UI and added custom theme support for it. I have also made some changes in dark theme action bar, background color of webview, made some changes in webview css(justified text but buttons are not justified, see the images). with the change in theme ic_drawer changes color(white and grey) I hope you would love overall design

![screenshot_2014-04-17-02-00-01 1](https://cloud.githubusercontent.com/assets/5356702/2724705/76fecb6a-c5a4-11e3-8955-b8e1bbafd949.png)

![screenshot_2014-04-17-01-56-13 1](https://cloud.githubusercontent.com/assets/5356702/2724787/71e4d3d0-c5a5-11e3-8aac-555bc28fa12e.png)

![screenshot_2014-04-17-02-09-41 1](https://cloud.githubusercontent.com/assets/5356702/2724896/1fee04b4-c5a7-11e3-870f-5731d72f254f.png)