logs in spec
Merge branch 'filter_logs' of https://github.com/ethereum/cpp-ethereum into logs

Conflicts:
	libweb3jsonrpc/abstractwebthreestubserver.h
	libweb3jsonrpc/spec.json
	test/webthreestubclient.h
common changes
logs method in ethereum.js
Merge branch 'filter_logs' of https://github.com/ethereum/cpp-ethereum into logs