Allow zero fee transactions on regtest network

Fixed script iteration in bloom filter

update tags in CI and test gihub integration

Miner fee calculation in memory pool

BCH Nov2018 HF: enforce clean-stack restriction for scripts

BCH Nov2018 HF: enforce push-only restriction for scriptsig

BCH Nov2018 HF: min tx size is 100 bytes

BCH Nov2018 HF: OP_CHECKDATASIG + OP_CHECKDATASIGVERIFY

BCH Nov2018 HF: canonical transaction ordering

Always ask for witness when requesting b/tx on --btc chain

Add doc about default RPC ports

Fix panic when started for the first time without selecting a fork

Fix #530

Fix Params deserialization on serde_json>=1.0.8