Fixes to notifications (#216)

* Improve push-notification for follows

* Refresh notifications on screen open (close #214)

* Avoid showing loader more than needed in post threads

* Refactor notification polling to handle view-state more effectively

* Delete a bunch of tests taht werent adding value

* Remove the accounts integration test; we'll use the e2e test instead

* Load latest in notifications when the screen is open rather than full refresh

__mocks__/react-native-svg.js

@@ -0,0 +1,67 @@
+// @flow
+
+// https://github.com/FormidableLabs/react-native-svg-mock
+import React from 'react'
+
+const createComponent = function (name: string) {
+  return class extends React.Component {
+    // overwrite the displayName, since this is a class created dynamically
+    static displayName = name
+
+    render() {
+      return React.createElement(name, this.props, this.props.children)
+    }
+  }
+}
+
+// Mock all react-native-svg exports
+// from https://github.com/magicismight/react-native-svg/blob/master/index.js
+const Svg = createComponent('Svg')
+const Circle = createComponent('Circle')
+const Ellipse = createComponent('Ellipse')
+const G = createComponent('G')
+const Text = createComponent('Text')
+const TextPath = createComponent('TextPath')
+const TSpan = createComponent('TSpan')
+const Path = createComponent('Path')
+const Polygon = createComponent('Polygon')
+const Polyline = createComponent('Polyline')
+const Line = createComponent('Line')
+const Rect = createComponent('Rect')
+const Use = createComponent('Use')
+const Image = createComponent('Image')
+const Symbol = createComponent('Symbol')
+const Defs = createComponent('Defs')
+const LinearGradient = createComponent('LinearGradient')
+const RadialGradient = createComponent('RadialGradient')
+const Stop = createComponent('Stop')
+const ClipPath = createComponent('ClipPath')
+const Pattern = createComponent('Pattern')
+const Mask = createComponent('Mask')
+
+export {
+  Svg,
+  Circle,
+  Ellipse,
+  G,
+  Text,
+  TextPath,
+  TSpan,
+  Path,
+  Polygon,
+  Polyline,
+  Line,
+  Rect,
+  Use,
+  Image,
+  Symbol,
+  Defs,
+  LinearGradient,
+  RadialGradient,
+  Stop,
+  ClipPath,
+  Pattern,
+  Mask,
+}
+
+export default Svg