Accessibility fixes for Image and Text

src/components/Image/index.js

@@ -190,10 +190,10 @@ class Image extends React.Component {
     return (
       <View
         accessibilityLabel={accessibilityLabel}
+        accessibilityRole='img'
         accessible={accessible}
         className={'Image'}
         component='div'
-        role='img'
         style={{
           ...(styles.initial),
           ...resolvedStyle,

src/components/Text/index.js

@@ -37,6 +37,7 @@ class Text extends React.Component {
   static stylePropTypes = TextStylePropTypes
 
   static defaultProps = {
+    accessible: true,
     component: 'span',
     style: styles.initial
   }

src/modules/specHelpers/index.js

@@ -24,8 +24,11 @@ export const assertProps = {
   },
 
   accessible: function (Component, props) {
-    // accessible
-    let dom = renderToDOM(<Component {...props} accessible />)
+    // accessible (implicit)
+    let dom = renderToDOM(<Component {...props} />)
+    assert.equal(dom.getAttribute('aria-hidden'), null)
+    // accessible (explicit)
+    dom = renderToDOM(<Component {...props} accessible />)
     assert.equal(dom.getAttribute('aria-hidden'), null)
     // not accessible
     dom = renderToDOM(<Component {...props} accessible={false} />)