Summary:
This is necessary because our example resources are contained in a "global" scope (the catalog), so all resource names must be unique.
Closes https://github.com/google/material-components-ios/issues/373.
Reviewers: #mdc_ios_owners, randallli
Reviewed By: #mdc_ios_owners, randallli
Projects: #material_components_ios
Differential Revision: http://codereview.cc/D648