Added RNFS and refactor image upload to use it

mobile/src/Home/Home.js

@@ -47,8 +47,6 @@ export class Home extends React.Component {
       workItemDistance: -1,
     }
 
-    this.watchId = null
-
     if (Platform.OS !== "ios") {
       ensurePermissions(
         [
@@ -130,13 +128,6 @@ export class Home extends React.Component {
       })
   }
 
-  componentWillUnmount() {
-    if (this.watchId) {
-      navigator.geolocation.clearWatch(this.watchId)
-      this.watchId = null
-    }
-  }
-
   @autobind
   handleMessageDismiss() {
     this.setState({ messageModal: null })
@@ -255,6 +246,17 @@ export class Home extends React.Component {
     this.setState({ showWorkItems: !this.state.showWorkItems })
   }
 
+  @autobind
+  handleCalloutPress(workItem) {
+    if (api.loggedInUser.administrator) {
+      this.props.history.push(
+        `/arviewer?workItemId=${workItem._id}&workItemType=${
+          workItem.workItemType
+        }`
+      )
+    }
+  }
+
   render() {
     const {
       sections,
@@ -310,7 +312,7 @@ export class Home extends React.Component {
                     : hardhatPinImage
               }
               onPress={(e) => this.handleMarkerPress(e, index)}>
-              <Callout>
+              <Callout onPress={() => this.handleCalloutPress(workItem)}>
                 <View>
                   <Text>
                     {pad(workItem.ticketNumber, 4) +