Update wrapper.php based on version that is now part of official documentation and update references in app.yaml.

Memcache module no longer requires patching since the Memcache implemention on App Engine has been corrected to provide the missing constant.

Remove skip_files directive from app.yaml since it is unnecessary and overrides default filter which is better.

Issue #2144081: Remove call to drupal_realpath() in image.gd.inc since it voids stream wrapper support.

Functions such as file_stream_wrapper_get_instance_by_scheme('gs') construct
the stream wrapper without a proper URI which is fine and should be allowed. Any
errors due to trying to use the stream wrapper in that state should come from
underlying GA stream wrapper.

The integration automatically switched the queue implementation to AE push
queues for queues that have an associated worker defined by
hook_cron_queue_info().

Correct incorrect variable name for drupal_static() reference made in google_appengine_default_storage_bucket() and google_appengine_file_element_types().

Add core.patch which includes all the files that should be placed in root and changes made to Drupal core.

Rename system/public/files router to system/public to be consistent with system/temporary and system/files.

Add explicit handler for Drupal file routers to ensure they are not interpreted as static resources.