Update exchange rate plugin for Winkdex

updated exchange rate BTC price for Winkdex API that was officially published
update historical winkdex api
Merge pull request #766 from wozz/winkdex

Update exchange rate plugin for Winkdex
make daemon usable with the GUI
daemon notifications (network.status)
adapt network dialog to daemon
daemon: use Popen with close_fds=True
command line: wait until daemon is connected
daemon status info
fix daemon timeout
proper start and stop commands for daemon
send server height and server lag with daemon
gui should always use daemon if it is running
interface.py: print -> print_error
default daemon timeout after 5 minutes
fix
call json.dump on request
rename process_response
interface: use parse_json
Merge branch 'master' of github.com:spesmilo/electrum into clean