v0.1.4

This new release includes quite a range of changes.

I'm very happy to announce that this release includes support for event log filtering. Which means ExW3 can now be a viable contender for actually building applications.

Notably, switched from ganache-cli to parity for testing. Should've done this earlier, because ganache-cli seems to be okay with non 0x prepended data... After switching to parity these bugs were found. Once again big shout out to @wonjun with his simple commit. I wouldn't have thought about checking such a disastrous bug until I noticed his fork.

Also added a helper for keccak256 hashing.