Use :path key w/in Podfiles, :local is deprecated

Warning from `pod install`:

    [!] The `:local` option of the Podfile has been renamed to `:path` and is deprecated.
Add appendItem to Array data source, docs & styles cleanup
Fix a missing exception in base data source
SSDataSources tests!

Tests contributed by @andrewsardone.

Consolidated Examples into a single app.