Added full version and better script assertions output.
Added .appengine to import.
Fixed tests so differences in python lib path are eliminated.
Simplyfied. Removed a lot of constants.
The zip_path attribute moved outside the run method.
Fixed a bug when _download_gae() was passed an unexpected argument.
Updated the version to 1.9.12.1.
Merge branch 'master' into gae-sdk-1.9.11

Conflicts:
	README.rst
	setup.py
	version.py