Fix detection of TCP connection failure.
Changed to use protobuf_lite rather than full protobuf library.
Added network_test_helper which checks if a local test network is running, or starts one as a zombie process if not, then returns.
Merge branch 'next' into tcp_update

Conflicts:
	src/maidsafe/vault_manager/config.cc
	src/maidsafe/vault_manager/tcp_connection.cc