netting channel state changes fixes
netting channel state changes fixes

- the close event has the closing address in it, there is no need to
query the blockchain
- the withdraw/close/settle transactions may fail, added a catch for
withdraw transaction

tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,hackaugusto/raiden,tomashaber/raiden,hackaugusto/raiden