Add ByjovePlugin for sake of $hasPerm() method

hopefully this will be home to more things over time?

src/index.js

@@ -1,4 +1,5 @@
 
+export * from './plugin'
 export * from './components'
 
 export {ByjoveStoreConfig} from './store'

src/plugin.js

@@ -0,0 +1,18 @@
+
+export function ByjovePlugin(Vue) {
+    Vue.mixin({
+        methods: {
+
+            $hasPerm(name) {
+
+                // if user is root then assume permission
+                if (this.$store.state.user_is_root) {
+                    return true
+                }
+
+                // otherwise do true perm check for user
+                return this.$store.state.permissions.includes(name)
+            },
+        }
+    })
+}