Block hash download fix.
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop
More inclusive about.
Minor networking improvements.
Guards for View.
Improved logging.
Add mutexed askedContains in placed of .asked.contains(). Issue #333 (dev::RangeMask<unsigned int>::contains), nextFetch clears m_asked concurrent to m_asked.contains() iteration.
merged upstream