Merge pull request #987 from obscuren/develop

core/block_processor.go

core/chain_makers.go

core/chain_manager.go

core/chain_manager_test.go

core/error.go

core/events.go

core/manager.go

eth/backend.go

eth/downloader/downloader.go

eth/downloader/downloader_test.go

eth/downloader/events.go

miner/miner.go