Update README.md
Add signing config and update release build config.
Update .gitignore for `gradle-local.properties` in sub-projects.
Merge branch 'feature/signing-configs' into develop
Add link to Play Store.
Add Bitdeli badge.
Remove "empty view" of the card list.
Remove "loading foot view" of the card list.
Add "loading progress bar" at top of the card list.
Change condition to load more.
Replace ListView by GridView to display cards.
Pause image loader while scrolling.
Adjust text size of card caption.
Don't reload when orientation is changed.
Check orientation on start.
Merge branch 'feature/cards-grid-view' into develop
Cache images on SD card/external storage.
Retain scroll position of card list.
Move "loading bar" to bottom and make it more obvious.
Merge branch 'feature/polish-card-list' into develop