Null hash in fbchain file for missing block
null exception in clearAssetRefs
Big genesis quantity bug
Checking hash in PeerGroup.getBlock
Merge branch 'develop'
Get changes that were committed to master instead of develop.

Merge branch 'master' into develop
Merge branch 'develop' of https://github.com/coinspark/sparkbit-bitcoinj into develop
Merge branch 'develop' of https://github.com/coinspark/sparkbit-bitcoinj into develop
Merge branch 'develop' of https://github.com/coinspark/sparkbit-bitcoinj into develop
Merge branch 'develop' of https://github.com/coinspark/sparkbit-bitcoinj into develop
Add getter/setter to enable sending invalid assets (experimental).