Remove examples/loader.js

That script was used when Plovr was used for running the examples.

build.py

@@ -100,7 +100,6 @@ EXAMPLES_SRC = [path
                 if not path.startswith('examples/bootstrap')
                 if path != 'examples/Jugl.js'
                 if path != 'examples/jquery.min.js'
-                if path != 'examples/loader.js'
                 if path != 'examples/example-list.js']
 
 EXAMPLES_JSON = ['build/' + example.replace('.html', '.json')