Added an example of using the support library for a demonstration

Currently, when using the support library in an Espress/Robolectric project, the support library included for testing by Robolectric will cause a conflict to occur when running Espresso tests. This will causes any usages of classes involving classes from the support library to result in NoClassDefFoundErrors to be thrown.

To remedy this, simply adding `exclude group: 'com.android.support', module: 'support-v4'` to the list of excludes for Robolectric will fix it.

I added support library usage to the app as a demonstration. Try removing the above mention exclude and watch the Espresso tests fail.