backup progress
Merge branch 'develop' of https://github.com/bither/bither-android into feature/backup_progress
add fadeout of detailView
Merge branch 'develop' of https://github.com/bither/bither-android into feature/fancy_qr_code
Merge branch 'feature/fancy_qr_code' of https://github.com/bither/bither-android into feature/fancy_qr_code