Stack/argument awareness in LLL.
Call and multi in LLL.
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop

Conflicts:
	libethereum/Instruction.h
No libsnappy - it breaks my build.
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop

Conflicts:
	libethereum/CMakeLists.txt