feat(plugins): worked on plugin dashboard import handling

tests/app-plugin-json/plugin.json

@@ -1,48 +0,0 @@
-{
-  "type": "app",
-  "name": "App Example",
-  "id": "app-example",
-
-  "staticRoot": ".",
-  "module": "app",
-
-  "pages": [
-    {"name": "Example1", "url": "/app-example", "reqRole": "Editor"}
-  ],
-
-  "css": {
-    "light":  "css/plugin.dark.css",
-    "dark":   "css/plugin.light.css"
-  },
-
-  "info": {
-    "description": "Example Grafana App",
-    "author": {
-      "name": "Raintank Inc.",
-      "url": "http://raintank.io"
-    },
-    "keywords": ["example"],
-    "logos": {
-      "small": "img/logo_small.png",
-      "large": "img/logo_large.png"
-    },
-    "screenshots": [
-      {"name": "img1", "path": "img/screenshot1.png"},
-      {"name": "img2", "path": "img/screenshot2.png"}
-    ],
-    "links": [
-      {"name": "Project site", "url": "http://project.com"},
-      {"name": "License & Terms", "url": "http://license.com"}
-    ],
-    "version": "1.0.0",
-    "updated": "2015-02-10"
-  },
-
-  "dependencies": {
-    "grafanaVersion": "2.6.x",
-    "plugins": [
-      {"type": "datasource", "id": "graphite", "name": "Graphite", "version": "1.0.0"},
-      {"type": "panel", "id": "graph", "name": "Graph", "version": "1.0.0"}
-    ]
-  }
-}