Estimate gas is broken. Provide max gas limit.
Estimate gas is broken. Provide max gas limit.

With byzantium the `revert` operation does not consume all gas so
providing a big gas limit is not that detrimental. Plus after byzantium
the `estimate_gas()` call is not working properly so we can no longer
rely on it.

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