PipelineEvent fixes (#202)

* Fix the PipelineEvent struct, with proper sub struct for Runner and correct type for the artifacts_file 'size' field

* Updated tests for changes to PipelineEvent

* Formatting

* Naming

events.go

@@ -509,10 +509,15 @@ type PipelineEvent struct {
 			Username  string `json:"username"`
 			AvatarURL string `json:"avatar_url"`
 		} `json:"user"`
-		Runner        string `json:"runner"`
+		Runner struct {
+			ID          int    `json:"id"`
+			Description string `json:"description"`
+			Active      bool   `json:"active"`
+			IsShared    bool   `json:"is_shared"`
+		} `json:"runner"`
 		ArtifactsFile struct {
 			Filename string `json:"filename"`
-			Size     string `json:"size"`
+			Size     int    `json:"size"`
 		} `json:"artifacts_file"`
 	} `json:"builds"`
 }

events_test.go

@@ -284,10 +284,15 @@ func TestPipelineEventUnmarshal(t *testing.T) {
             "username": "root",
             "avatar_url": "http://www.gravatar.com/avatar/e32bd13e2add097461cb96824b7a829c?s=80\u0026d=identicon"
          },
-         "runner": null,
+         "runner": {
+            "id": 6,
+            "description": "Kubernetes Runner",
+            "active": true,
+            "is_shared": true
+         },
          "artifacts_file":{
-            "filename": null,
-            "size": null
+            "filename": "artifacts.zip",
+            "size": 1319148
          }
       },
       {