Catalog prop-types issue (#115)

It seems that windows has an issue referencing local nodes. For now we can get round this by referencing the git repo. 

There are some other minor cleanups also.

Author: nickwinder

README.md

@@ -717,17 +717,18 @@ to navigate the file system.
 1. Clone the repository. `git clone https://github.com/PSPDFKit/react-native.git`.
 2. From the command promt `cd react-native\samples\Catalog`.
 3. Make sure `react-native-cli` is installed: `npm install -g react-native-cli`.
-4. Edit `package.json` to change the version of `react-native` to `0.53.0`
+4. Edit `package.json` to change the version of `react-native` to `0.53.0` and refernce the react-native 
+pspdfkit repo online.
 ```diff
 "dependencies": {
 "react": "16.3.1",
 -"react-native": "0.55.4",
 +"react-native": "0.53.0",
 "react-native-fs": "2.10.14",
-"react-native-pspdfkit": "file:../../",
+-"react-native-pspdfkit": "file:../../",
++"react-native-pspdfkit": "github:PSPDFKit/react-native",
 "react-native-windows": "0.53.0",
-"react-navigation": "^1.0.3",
-"rnpm-plugin-windows": "0.2.8"
+"react-navigation": "^1.0.3"
 }
 ```
 5. run `npm install`.

samples/Catalog/package.json

@@ -11,7 +11,9 @@
     "react-native-fs": "2.10.14",
     "react-native-pspdfkit": "file:../../",
     "react-native-windows": "0.53.0",
-    "react-navigation": "^1.0.3",
+    "react-navigation": "^1.0.3"
+  },
+  "devDependencies": {
     "rnpm-plugin-windows": "0.2.8"
   }
 }

samples/Catalog/windows/Catalog/project.json

@@ -1,9 +1,7 @@
 {
-  "dependencies": {
-    "Microsoft.NETCore.UniversalWindowsPlatform": "6.1.5"
-  },
+  "dependencies": {},
   "frameworks": {
-    "uap10.0.14393": {}
+    "uap10.0.10586": {}
   },
   "runtimes": {
     "win10-arm": {},
@@ -13,4 +11,4 @@
     "win10-x64": {},
     "win10-x64-aot": {}
   }
-}
+}