Merge pull request #7 from akshayaurora/kivy

- avoid usage of signals in exchange_rate.py so that it can be used by
[Lite gui] Allow changing quote currency backwards with right click
Merge pull request #246 from PabloCastellano/master

Improve lite gui usability
whitespaces option in format_satoshis
confirmation dialog before sending large amounts
redefine do_send as a wrapper for send_tx
Added notifications when receiving a new transaction
Rework notify so it's thread safe
Reworked notification flow and combined multiple transactions into one notification
Make sure we specify dual-arch
Renamed to tray and added exit option
use self.base_unit()
update BIP32 to its final spec
try.. except wrapper for ncurses.set_curs
fix settings dialog in text gui
fix popup navigation
fix for empty addressbook
better backspace detection
Set the current balance in the tray icon
Added some basic hide/show functionality to the tray icon

Real 'hide-to-tray' functionality seems impossible, see comments