Merge pull request bitshares#630 from bitshares/release

Merge release to master

Merge pull request bitshares#617 from bitshares/release

Merge release to master

bump database

Merge pull request bitshares#530 from bitshares/release

Release

Merge branch 'release' into testnet

Merge branch 'testnet_release'

Merge branch 'testnet_release' into testnet

Add rnglab's seed node for testnet

Merge branch 'testnet_release' into testnet

Merge pull request bitshares#443 from bitshares/fix-399-debug-plugin-…

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Rename option of debug witness plugin, fix bitshares#399