Minor bugfix release

Feature:

• Added feature to force pull a image in the Fluent API (Issue #84). Now it is possible to do

using (
        var container =
          Fd.UseContainer()
            .UseImage("postgres:latest", force: true) // default will be false
            .ExposePort(5432)
            .WithEnvironment("POSTGRES_PASSWORD=mysecretpassword")
            .WaitForProcess("postgres", 30000 /*30s*/)
            .Build()
            .Start())
      {
        var config = container.GetConfiguration(true);
        AreEqual(ServiceRunningState.Running, config.State.ToServiceState());
      }

Bugs:

• Fixed bug (Issue #85) where network name and id was mixed up in the Network Service.
• Bugfix from @volkovku where invalid characters in PATH environment variable would break DockerBinaryResolver