Fixing "Attribute::Handlers" warning "Declaration may clash with future reserved word",
    changing __log attribute to __logMe
Fixed Makefile.PL syntax error
Modified integration tests to not fail if no docker api is available

 - now depends on "DOCKER_TEST_HOST" env var to connect a docker api
 if not exists skip tests
Create 000_compile.t, to check dependencies
Docker.pm should load necesary dependencies previously