read infos from package.json

Summary:
Adding the properties from a plugin's `package.json` as static properties to the class.
The name from `package.json` is used as it's `id`.

This allows us in the future to add meta information about a plugin to it's package.json and still use the data inside the app.

Reviewed By: priteshrnandgaonkar

Differential Revision: D13417288

fbshipit-source-id: 3d0a62d4cb0115153cce1aaee677b9680fefebf4

src/chrome/MainSidebar.js

@@ -146,11 +146,11 @@ class PluginSidebarListItem extends Component<{
       <ListItem active={isActive} onClick={this.props.onClick}>
         <PluginIcon
           isActive={isActive}
-          name={plugin.icon}
+          name={plugin.icon || 'apps'}
           backgroundColor={iconColor}
           color={colors.white}
         />
-        <PluginName>{plugin.title}</PluginName>
+        <PluginName>{plugin.title || plugin.id}</PluginName>
       </ListItem>
     );
   }
@@ -228,7 +228,11 @@ class MainSidebar extends PureComponent<MainSidebarProps> {
             }>
             <PluginIcon
               color={colors.light50}
-              name={numNotifications > 0 ? NotificationsHub.icon : 'bell-null'}
+              name={
+                numNotifications > 0
+                  ? NotificationsHub.icon || 'bell'
+                  : 'bell-null'
+              }
               isActive={selectedPlugin === NotificationsHub.id}
             />
             <PluginName