Adds both build and push support

This adds support for building and pushing docker containers
when you perform either `kompose convert` or `kompose up`.

Docker Compose files who have build parameters with their respective
image and build keys will automatically be both built and pushed.

pkg/kobject/kobject.go

@@ -39,6 +39,7 @@ type ConvertOptions struct {
 	CreateDeploymentConfig      bool
 	BuildRepo                   string
 	BuildBranch                 string
+	Build                       string
 	CreateChart                 bool
 	GenerateYaml                bool
 	GenerateJSON                bool