show/raise install dialog

make sure install dialog doesn't show up behind other windows when
electrum is started
Merge pull request #703 from wozz/install-show

show/raise install dialog
fix #682
Merge branch 'master' of https://github.com/spesmilo/electrum into testnet
class MyVerifyingKey, with constructor to submit to python-ecdsa
update imported keys
fix: wizard 2of2
fix: wizard 2of2 (cosigning key)
move tests to unittest format
check message length in mnemonic encode
unit test for aes
fix get_pubkey for imported keys
do not raise an error if user config file is corrupted
simplify send tab layout (unneeded vbox)
paytoedit
parse payto text
handle units in AmountEdit
paytoedit
parse payto text
read amounts