Added functionality

lib
- Save
- DoAction
- ApplyDataset
- GetLayer(s)

main
- do actions from commandline

Improved test cases!

cmd/ps/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"github.com/sbrow/ps"
+	"os"
+)
+
+func main() {
+	args := []string{}
+	cmd := ""
+	switch {
+	case len(os.Args) > 1:
+		args = os.Args[2:]
+		fallthrough
+	case len(os.Args) > 0:
+		cmd = os.Args[1]
+	}
+
+	fmt.Println(os.Args, cmd, args)
+	if cmd == "action" {
+		err := ps.DoAction(args[0], args[1])
+		if err != nil {
+			panic(err)
+		}
+	}
+}