Add sweep service
Base ui
Add filter for display balance
Fixes importing private key
Integrate feedback: better UI
Merge pull request #4 from eordano/feature/sweep

Sweeping working 100%
Bump copay version: huge performance improvement
Make qr size relative to the screen
Pin pad style
Update copay lib and vendors
Refactor sign method to synchronous interface
Update version to 0.8.2