files: turn off page.js click handler

because it prevents preventDefault on file links (sometimes)

then use it explicitly where we need it, on the left/right
preview buttons

test plan:
 - go to user files (/files)
 - have multiple image files in a folder
 - reload the page, then click an image file
 - it should preview, not download
 - clicking the left/right arrows at the
   side of the preview window should go to the
   previous/next image without reloading the page

fixes ADMIN-2923

Change-Id: Ib97d25d51e7c94fb962e5d24d3c763554e7fcdd4
Reviewed-on: https://gerrit.instructure.com/212876
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
QA-Review: Carl Kibler <ckibler@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>

app/jsx/files/FilePreview.js

@@ -207,6 +207,7 @@ export default class FilePreview extends React.PureComponent {
             this.getNavigationParams({id: nextItem.id})
           )}`}
           className="ef-file-preview-container-arrow-link"
+          onClick={e => page.clickHandler(e.nativeEvent)}
         >
           <div className="ef-file-preview-arrow-link">
             <span className="screenreader-only">{linkText}</span>

app/jsx/files/router.js

@@ -100,7 +100,7 @@ page('/folder/*', getFolderSplat, renderShowFolder)
 
 export default {
   start() {
-    page.start()
+    page.start({click: false})
   },
   getFolderSplat // Export getSplat for testing
 }

package.json

@@ -108,7 +108,7 @@
     "moment": "^2.10.6",
     "newless": "^0.3.0",
     "normalize-scroll-left": "^0.2",
-    "page": "visionmedia/page.js#1.6.4",
+    "page": "^1.11",
     "parse-decimal-number": "1.0.0",
     "parse-link-header": "^1",
     "prop-types": "^15",

yarn.lock

@@ -15189,9 +15189,10 @@ package-hash@^3.0.0:
   resolved "https://registry.yarnpkg.com/package/-/package-1.0.1.tgz#d25a1f99e2506dcb27d6704b83dca8a312e4edcc"
   integrity sha1-0lofmeJQbcsn1nBLg9yooxLk7cw=
 
-page@visionmedia/page.js#1.6.4:
-  version "1.6.4"
-  resolved "https://codeload.github.com/visionmedia/page.js/tar.gz/d11509f1f0fed0309391d995919c25dce84b8abd"
+page@^1.11:
+  version "1.11.5"
+  resolved "https://registry.yarnpkg.com/page/-/page-1.11.5.tgz#0cfc8608be337f26f4377f31df0787aef0ca1af7"
+  integrity sha512-0JXUHc7Y8p1cPJQbhZSwaKO3p+bU3Rgny+OM5gJMKHWHvJKan/fsE5RUzEjRQolv9DzPOSVWfSOHz0lLxK19eA==
   dependencies:
     path-to-regexp "~1.2.1"