bug-58 Card UI:

1. Include genzeb's filp library to create 3D filp view.
2. Include Picasso library for download and caching images.
3. Link to Wikipeddia.
3. Use icomoon font on previous and next button.
4. When it can't display card content correctly, show error card UI. 

Why should we differentiate those two cases, back and front? I feel we may just stop at the first error occurrence.