Upgrade Browserify and browserify-shim

This fixes an issue where duplicate sourcemaps were
created for modules which had Browserify shims applied to them such
as annotator.js and annotator.document.js. The duplicated
sourcemaps were not stripped from the bundle by exorcist,
resulting in a much larger production build than necessary.

package.json

@@ -17,9 +17,9 @@
     "autoprefixer": "^6.0.3",
     "babelify": "^6.1.3",
     "bootstrap": "3.3.5",
-    "browserify": "^9.0.3",
+    "browserify": "^13.0.0",
     "browserify-ngannotate": "^1.0.1",
-    "browserify-shim": "^3.8.3",
+    "browserify-shim": "^3.8.12",
     "coffeeify": "^1.0.0",
     "compass-mixins": "^0.12.7",
     "core-js": "^1.2.5",