Import WalletFactory instead of Wallet
WalletFactory and WalletBitkey classes
--usb parameter enables experimental support for bitkey protocol
Merge pull request #91 from slush0/bitkey

Import WalletFactory instead of Wallet
Add slush's bitwallet files to setup
POS: request amount in other currencies and convert to BTC
export seed in gui/restore from seed
seed dialog simplification
restore from mpk (text)
remove until an easy way back is provided
fix regression caused by tooltips
text change: access -> install
enable gui switch button (classic <-> lite) both ways