Merge pull request #1 from ethereum/develop

Update to current cpp-ethereum
Fix build by including all files from CryptoPP that compile without errors or warnings.
Fix build on Windows. QWebSettings is somehow not available.
Upstream fix
Merge pull request #3 from ethereum/develop

Update from upstream
Merge pull request #331 from AronVanAmmers/develop

Fix build of CryptoPP on Windows