Add block explorer setting for "view online"
Merge pull request #667 from wozz/blockexplor

Add block explorer setting for "view online"
get_master_public_keys
Merge branch 'master' of git://github.com/spesmilo/electrum
dark/light icon selector. see #666
fix: get_master_public_key
move tray logic to ElectrumGui object. fixes #468
rm dead code
watching_only wallets have a single account
gui: don't show account names if there is only one account
sweep command (does not broadcast)
add_cold_seed
fix input_info for signrawtransaction
fix: add_seed
fix signrawtransaction
global timeout in peers script
add_seed
show_before_broadcast option in gui
sort accounts
add layout before creating buttons, so that default button is set