added ability to have multiple phantomjs processes

README.md

@@ -28,3 +28,29 @@ func main() {
   // Output: 4
 }
 ```
+
+More Complex Usage
+```go
+import (
+  "github.com/urturn/go-phantomjs" // exported package is phantomjs
+)
+
+func main() {
+  p, err := phantomjs.Start()
+  if err != nil {
+    panic(err)
+  }
+  defer p.Exit() // Don't forget to kill phantomjs at some point.
+  var result interface{}
+  err = p.Run("function(done){ setTimeout(function() { done(3 + 3) ; }, 0);", &result)
+  if err != nil {
+    panic(err)
+  }
+  number, ok := result.(float64)
+  if !ok {
+    panic("Cannot convert result to float64")
+  }
+  fmt.Println(number)
+  // Output: 4
+}
+```