Improve process addition and removal

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

implement pause and resume

Add godeps

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add readme

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

container.go

@@ -11,13 +11,38 @@ type Process interface {
 	Spec() specs.Process
 	Signal(os.Signal) error
 }
+type Status string
+
+const (
+	Paused  Status = "paused"
+	Running Status = "running"
+)
+
+type State struct {
+	Status Status `json:"status,omitempty"`
+}
 
 type Container interface {
+	// ID returns the container ID
 	ID() string
+	// Start starts the init process of the container
 	Start() error
+	// Path returns the path to the bundle
 	Path() string
+	// Pid returns the container's init process id
 	Pid() (int, error)
+	// SetExited sets the exit status of the container after it's init dies
 	SetExited(status int)
+	// Delete deletes the container
 	Delete() error
+	// Processes returns all the containers processes that have been added
 	Processes() ([]Process, error)
+	// RemoveProcess removes a specific process for the container because it exited
+	RemoveProcess(pid int) error
+	// State returns the containers runtime state
+	State() State
+	// Resume resumes a paused container
+	Resume() error
+	// Pause pauses a running container
+	Pause() error
 }