bug-63 lock card mode screen orientation
Merge pull request #16 from thomas771020/bug-63-lock-card-mode-screen-orientation

bug-63 lock card mode screen orientation, r=john-hu
bug-56: do the followings:
1. add download activity
2. add listadapter for language
3. change wordsstorage to support one db for a lang and category
combination.
4. add dialogutils
5. add errorutils
6. option dialog for partial downloaded db
Merge pull request #15 from john-hu/bug-56-download-ui

bug-56: do the followings, r=thomas.
Bug-58 Do the Followings:
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.